You can use a multi-meter! Adafruit offers a fun and exciting stickers to celebrate achievements in electronics, science and engineering. We believe everyone should be able to be rewarded for learning a useful skill, a great sticker is just one of the many ways to show and share. This is the "I learned how to use a multi-meter" sticker for use with educators, classrooms, workshops, Maker Faires, TechShops, Hackerspaces, Makerspaces and...

This massive multimeter has everything but the kitchen sink included. It's a great addition to any work bench or tool box.  It's low cost, simple to use, and has a big clear display with all the measurements you need and more! The multimeter includes: AC/DC Voltage measurementCurrent measurement, from 2mA range up to 20A range (both AC and DC)Beeping continuity test, and diode test for measuring voltage and lighting up...

When we're on the go, we like to keep a multimeter in our purse and this model is by far the best pocket meter we've found. It's so good you'll end up using it as your main multimeter! First up, this meter can measure nearly everything: it's got DC and AC voltage, resistance, diode, and beeping continuity test, capacitance, and frequency. And that's not all! It's also auto-ranging, has a data-hold button and turns...

You want the best multimeter in the world? OK, we got this! The Fluke 87V combo kit is built around the Fluke 87V in glorious Fluke Yellow. It's the most well-known, best-trusted & widely used industrial digital multimeter in the world, and includes special accessories to make you even more productive on the job. Adafruit has always coveted a Fluke meter and now we're an authorized distributor! The 87V is the best meter you can get...

If you're looking for one of the best multimeters, we're proud to now offer our personal favorite! The Extech EX330 "12 Function Mini MultiMeter + Non-Contact Voltage Detector. Autoranging DMM with NCV detector and Temperature function". This product is the winner of EEVBlog Multimeter Shootout (Extech press release) & Dave's site here and on top of that, its been our daily-use multimeter for over 3 years. It's...

Starting out on your electronics adventure? Want to wield the mighty soldering iron? Tired of saying "I'd totally get into electronics if I only knew what tools to get..."? Working with substandard equipment is a terrible way to learn electronics: a lot of frustration with too little success. The right tool set will keep you progressing without the stressing. This toolbox contains carefully selected hand tools that will last you...

Connect this to that without soldering using these handy mini alligator clip test leads. 15" cables with alligator clip on each end, color coded. You get 12 pieces in 6 colors. Strong and grippy, these always come in handy! We often use these in conjunction with a multimeter so we don't have to hold the probes in place. Compared to our Large alligator clip set, these clips are smaller and 'pointier' 12 piece set, color coded...

This breakout board will solve all your power-monitoring problems. Instead of struggling with two multimeters, you can just use the handy INA219B chip on this breakout to both measure both the high side voltage and DC current draw over I2C with 1% precision. Most current-measuring devices such as our current panel meter are only good for low side measuring. That means that unless you want to get a battery involved, you have to stick the...

This breakout board may well be the last current sensing solution you every need to buy. Not only can it do the work of two multimeters, but it can do it with amazing precision and flexibility. With it you can measure high or low side DC current, the bus voltage, and have it automatically calculate the power. It can do so over impressive voltage, current, and temperature ranges with better than 1% accuracy, all while delivering the data in an...

Have some USB logic analyzer, multimeter or oscilloscope and bumping up against the frustration of a shared earth ground? The Offspring (known for being electrical engineers) wisely sang "Ya gotta keep'em isolated!" Power and signal isolation improves common-mode voltage, enhances noise rejection, and permits two circuits to operate at different voltage levels. This handy little low-cost  USB Isolator is exactly what you...

This breakout board will solve all your current-monitoring problems. Instead of struggling with a multimeter, you can just use the handy INA169 chip on this breakout to both measure both the DC current draw and have a handy analog output that is with respect to ground. The analog output makes this an ideal breakout for feedback-loop control. Most current-measuring devices such as our current panel meter are only good for low side measuring. That...

Connect this to that without soldering using these handy mini alligator clip test leads. Approximately 4.5" overall cables with alligator clip on each end, color coded. You get 12 pieces in 6 colors. Strong and grippy, these always come in handy! We often use these in conjunction with a multimeter so we don't have to hold the probes in place. Compared to our Large alligator clip set, these clips are smaller and 'pointier'. These...

Battery power for your portable project! These batteries are good quality at a good price, and work fantastic with any of the kits or projects in the shop that use AAA's. This is a pack of 2 AAA batteries . These batteries are Alkaline (MnO2) chemistry, with a voltage range of 1.6V (fresh) to 0.8V (dead). The mAh capacity depends on discharge usage but at 25mA rate it is 1200mAh (check the datasheet in the download tab for more...

The INA219 FeatherWing makes power-monitoring problems a thing of the past. Instead of struggling with two multimeters, you can just use the handy INA219B chip on this breakout to both measure both the high side voltage and DC current draw over I2C with 1% precision. Works with any and all Feathers! Communicates over I2C so its super-simple to use, you can even change the I2C address to have up to 4 of these Wings on one Feather. Many...

The Grove Shield FeatherWing for Particle Mesh and all Feathers is an add-under for any Particle Mesh or Feather board, so that you can easily interface with Seeed's huge collection of Grove sensors. Now you can have full range of hundreds of Grove modules with Particle Mesh along with our Feather line! Working with Grove requires no soldering. Just plug the sensors, actuators, or displays into this shield via a Grove cable (not included),...

This anti-static work mat is great for electronic work and repair, especially delicate or ESD sensitive work. It's 2mm thick and has a very high-resistance covering, like 10's of Megaohms. There's a clip attached that you need to connect to an earth ground in order to ground the mat. Usually, folks connect it to a known-grounded metal chassis. While this mat is somewhat heat-resistant it is not as resistant as our silicone mats, so...

Connect this to that without soldering using these handy alligator clip test leads. 20" cables with alligator clip on each end, color coded. You get 10 pieces in 5 colors. Strong and grippy, these always come in handy! We often use these in conjunction with a multimeter so we don't have to hold the probes in place. Compared to our small alligator clip set, these clips are longer (1.5" long) 10 piece set, color coded vinyl covered...

Keep your power source safe and toasty in these waterproof 3xAA battery holders. They're just like classic switched battery holders, but designed for survival! The case has a rubber gasket around the edge of the case (its black and hard to see in the photos but it is there) and attaches together with 4 machine screws. What we like about this design is that the hexnuts are captive in one side and you can assemble/disassemble as many times as you...

Battery power for your portable project! These batteries are high quality at a good price, and work fantastic with any of the kits or projects in the shop that use 9V These batteries are Alkaline (MnO2) chemistry, with a voltage range of 9.6V (fresh) to 4.8V (dead). The mAh capacity depends on discharge usage but at 50mA rate it is about 500mAh (check the datasheet in the download tab for more details) These work perfectly with our 9v clip, 9v...

We're always digging around for various test lines to use with our power supply - whether we're checking current draw of our Feather, or trying out new LED samples. We picked up one of these and its so handy we use it all the time now. It's compact and has three of the most useful connectors on the end. Great for use with your bench top equipment or even a multimeter with banana jacks. Each connector has two banana plugs that go into...

Electronics and water don't usually mix - which is why liquid level sensing projects can be a little challenging. You can DIY a sensor but keeping it clean and un-oxidized can be a pain. The Optomax Digital liquid level switches are a clever solution for when you need a small sensor to detect liquid/water: super easy to use and very durable too! Inside the plastic sensor casing is an infrared (IR) LED and matching photo transistor. When in...

The Pogo Pin Probe Clip is a great way to test and connect with pin-point accuracy without soldering! It's sort of like an alligator clip with a built in springy pogo pin - so you can connect to any PCB pad for 'scoping, analyzing or multimetering The clip is strong enough to grip onto a PCB, but has a soft grip so it won't mar or damage circuits. The 'tongue' is a round-tip pogo pin - a little spring-loaded contact...

How good is your multimeter really ?  Or maybe your analog converter needs a good reference? Or lets say you want to test your microcontroller's conversion accuracy & precision. If only you had a dependable, high precision, rock-solid voltage reference. Now you know why we made this very cute and useful little breakout board. It has two very high precision shunt-type voltage references with 750 ohm biasing resistors. One is 2.048V...

Connect this to that without soldering using these mini alligator clip test leads. 15" cables with alligator clip on each end in six colors. Strong and grippy, these always come in handy! We often use these in conjunction with a multimeter, so we don't have to hold the probes in place, or with wearable projects, or for quick prototyping with big-pad circuit boards like microbit & Circuit Playground. Compared to our large alligator...

Connect this to that without soldering using these small alligator clip test leads. 18" long cables with color-coded alligator clips on both ends. You get 6 pieces in 6 unique colors. Strong and grippy, these always come in handy! We often use these in conjunction with a multimeter so we don't have to hold the probes in place.  Compared to our large alligator clip set, these clips are smaller and 'pointier' 6 piece...

The Grove Shield FeatherWing for Particle Mesh and all Feathers is an add-under for many Particle Mesh or Feather board, so that you can easily interface with Seeed's huge collection of Grove sensors. Now you can have full range of hundreds of Grove modules with Particle Mesh along with our Feather line! Working with Grove requires no soldering. Just plug the sensors, actuators, or displays into this shield via a Grove cable (not included),...

These tweezers are perfect for anyone who does a lot of work with SMD components (and hey, who isn't these days?) Use these instead of squinting and trying to use clumsy multimeter probes to detect an LED's color, polarity or resistor/cap value! The multimeter 'probes' are the two tips of a tweezer-shaped multimeter. Simply 'grab' a resistor, capacitor, diode or LED to test. It has a "scanning" mode where it...

Battery power for your portable project! These batteries are good quality at a good price, and work fantastic with any of the kits or projects in the shop that use AAs. This is a pack of 4 AA batteries . These batteries are Alkaline (MnO2) chemistry, with a voltage range of 1.6V (fresh) to 0.8V (dead). The mAh capacity depends on discharge usage but for AA alkaline batteries it is typically 3000mAh (check the datasheet in the download tab...

Battery power for your portable project! These batteries are good quality at a good price, and work fantastic with any of the kits or projects in the shop that use AAA's. This is a pack of 3 AAA batteries . These batteries are Alkaline (MnO2) chemistry, with a voltage range of 1.6V (fresh) to 0.8V (dead). The mAh capacity depends on discharge usage but at 25mA rate it is 1200mAh (check the datasheet in the download tab for more details)....

Battery power for your portable project! These batteries are good quality at a good price, and work fantastic with any of the kits or projects in the shop that use AAs. This is a pack of 3 AA batteries . These batteries are Alkaline (MnO2) chemistry, with a voltage range of 1.6V (fresh) to 0.8V (dead). The mAh capacity depends on discharge usage but for AA alkaline batteries it is typically 3000mAh (check the datasheet in the download tab for...

If you own a MacBook, you'll recognize this little friend. The premise of this  2.1mm DC Barrel Jack to 2nd Generation MagSafe Adapter  is simple. There's a MagSafe plug on one end and a 5.5mm/2.1mm DC barrel jack with center positive polarity on the other. This allows you to connect a 15-20VDC power supply to something that expects to connect to 2nd gen. MagSafe. Since you can easily destroy hardware using this...

33 total. Each one peels off, they're about 2" x 2" each (50mm x 50mm). Individually the stickers are usually $1.50 each (a few are $1.00/$1.25 each). When you get all 33 you save $13.00 !   3D printing - Sticker! Oscilloscope - Sticker! Sparky the Magic Blue Smoke Monster - Sticker! Circuit bender! - Sticker! Micro-controllers - Sticker! Radiation sticker (yellow, sheet only, non-glowing) Learn to program - Sticker!...

What is this adorable little data dumpling? The millennial answer to Tamagotchi? Nay, it is the  Chibi Scope , the perfect companion to your Chibi Chip or, heck, any project where you want a portable way to view waveforms or ASCII text. The 'scope is a small, 1.3" diagonal OLED screen that doubles as an oscilloscope to help you understand the inner going-ons of your Chibi Chip. A veritable triple-threat, it packs three...

If you've ever owned a 1st generation MacBook, you'll recognize this little friend. The premise of this  2.1mm DC Barrel Jack to 1st Generation MagSafe Adapter  is simple. There's a MagSafe plug on one end and a 5.5mm/2.1mm DC barrel jack with center positive polarity on the other. This allows you to connect a 15-20VDC power supply to something that expects to connect to 1st gen. MagSafe. Since you can easily...

"These go to eleven."  11 millimeters that is! Our  Black Plated M/F Brass Standoffs  are engineered specifically to keep your Pi HAT snug on your Pi while also keeping the two boards separated, in particular the HDMI port. These standoffs can also be screwed into each other allowing stacking multiple HATs on to one Pi! They're the perfect companion for any Pi Hat combo. Each order comes with two...

Finally we get our very own super sweet sixteen... 16 millimeters that is! Our  Black Plated M/F Brass 16mm Standoffs  are engineered specifically to keep your PiTFT or other Pi accessories with extra tall headers properly secured while also keeping the two boards separated. These standoffs can also be screwed into each other just like the 11mm versions (made for PiHATs). Each order comes with two standoffs and two hex...

If you're like me, you've always wanted a smaller and faster way to sense an object between 0.5 and 5 centimeters away. If you're really like me, you've wanted the sensor to come with a low current draw and on a tiny carrier board with all of the external components required to make it work. The  Pololu Carrier with Sharp GP2Y0D805Z0F Digital Distance Sensor  fits those both needs and more. it's one of...

Praise the sun! You will never have that awkward situation where your caliper battery dies just when you need to take a measurement. Sure, if you have the budget, we recommend these near-indestructable high-end Mitutoyo calipers. But these are very fine calipers as well. The jaws are plastic, so not good for hot metal measurements or when you need perfectly flat jaws. In particular, these caught our eye since they are solar powered and have a...

The most useful tool we've ever laid our hands on. These calipers are really good quality and an excellent choice if you need something better than a cheap 'disposable' pair of digital calipers but you're not quite ready for a set of high-end Mitsutoyo calipers. These digital calipers work by having a capacitive sensor instead of a rack and pinion, so they never go out of alignment even if, say, you accidentally drop them (a few...

Sparki by Arcbotics is a new affordable, easy to use, and fun intro to programming, electronics, and robotics. It is geared towards kids elementary-age and above, educators looking for an easy intro to robotics, parents eager to find something affordable but educational and fun, DIY enthusiasts, and more. It is simple enough for beginners, while being feature-packed enough to be a must-have for pro-users. Sparki is your chance to have your very...

Bosch has been a leader in barometric pressure sensors, from the BMP085. BMP180, and BMP280... now we've got the next generation, the Adafruit BMP388 Precision Barometric Pressure sensor . As you would expect, this sensor is similar to its earlier versions but even better . The BMP388 has better precision than ever, which makes it excellent for environmental sensing or as a precision altimeter . It can even be used in either I2C and SPI...

Bosch has stepped up their game with their new BME280 sensor, an environmental sensor with temperature, barometric pressure and humidity! This sensor is great for all sorts of weather/environmental sensing and can even be used in both I2C and SPI! This precision sensor from Bosch is the best low-cost sensing solution for measuring humidity with ±3% accuracy, barometric pressure with ±1 hPa absolute accuraccy, and...

Bosch has stepped up their game with their new BMP280 sensor, an environmental sensor with temperature, barometric pressure that is the next generation upgrade to the BMP085/BMP180/BMP183. This sensor is great for all sorts of weather sensing and can even be used in both I2C and SPI! This precision sensor from Bosch is the best low-cost, precision sensing solution for measuring barometric pressure with ±1 hPa absolute accuraccy, and...

The long awaited BME680 from Bosch gives you  all the environmental sensing you want  in one small package. This little sensor contains  temperature ,  humidity ,  barometric pressure,  and  VOC gas  sensing capabilities. All over SPI or I2C at a great price! Like the BME280 & BMP280, this precision sensor from Bosch can measure humidity with ±3% accuracy, barometric pressure with ±1...

This pressure sensor from Freescale is a great low-cost sensing solution for precision measurement of barometric pressure and altitude. The MPL3115A2 has a typical 1.5 Pascal resolution, which can resolve altitude at 0.3 meters (compare to the BMP180 which can do 0.17m). It has some upsides compared to the BMP280, such as interrupt outputs for ultra-low power usage, and its also a heck of a lot easier to read altitude with a built in altimeter...

This pressure sensor from Freescale is a great low-cost sensing solution for measuring barometric pressure. At 1.5 hPa resolution, it's not as precise as our favorite pressure sensor, the BMx280 series, which has up to 0.03 hPa resolution so we don't suggest it as a precision altimeter. However, it's great for basic barometric pressure sensing. The sensor is soldered onto a PCB with 10K pull-up resistors on the I2C pins. This chip is...

You can use a multi-meter! Adafruit offers a fun and exciting "badges" of achievement for electronics, science and engineering. We believe everyone should be able to be rewarded for learning a useful skill, a badge is just one of the many ways to show and share. This is the "I learned how to use a multi-meter" badge for use with educators, classrooms, workshops, Maker Faires, TechShops, Hackerspaces, Makerspaces and around...

Chances are you spent time today poking into a circuit with two hands and then craning your neck over looking over at a multimeter display, which causes you to slip and lose your spot. OK well at least we had to do that, and that's when we decided it was time to pick up one of these pen-style digital multimeters. It's small and light but has a full featured multimeter inside. The ground probe is actually a wired clamp (it has a nice...

The ultimate shirt-pocket sized Pocket Digital Multimeter from Amprobe with frequency & capacitance measurements! This DMM is only 3/8” thick and weighs less than 3 oz. With full functionality offering AC and DC voltage to 600 V, resistance to 40 Megohm, capacitance to 3000 μF, frequency to 1 MHz, continuity w/beeper, and diode test. So handy, it's Ladyada's daily multimeter Fully autoranging, this meter offers seven...

You don't need an electrical engineering degree to start hacking electronics! This intuitive guide shows how to wire, disassemble, tweak, and re-purpose everyday devices quickly and easily. Packed with full-color illustrations, photos, and diagrams, Hacking Electronics teaches by doing--each topic features fun, easy-to-follow projects. Discover how to hack sensors, accelerometers, remote controllers, ultrasonic rangefinders, motors, stereo...

An essential companion when working on a ultra-low-power projects! If you've ever used a portable multimeter (even your $300 Fluke!) to measure sub-uA currents - say for a low power microcontroller or sensor project - you may notice that you're not getting the precision you expect, or that your project is acting finicky. How is this possible? – It’s called Burden Voltage. Many people are aware of Burden Voltage, but few...

By popular demand, we now have a project tutorial for how to make your own programmable, ultra-blinky LED belt. Perfect for parties, raves, parades, weddings, funerals, and bar mitzvahs. Wear it with pride, wear it with blinky! Follow our soldering tutorial to build your own heirloom LED belt, and hand it down to your grandkids. We designed this project to demonstrate how to use the digital LED strip, how to use our Atmega32u4 breakout board...

Learn circuit basics with these fun electronic blocks! These 46 blocks contain enough transistors, resistors, wireless microphones, and electronics buzzers to run up to 150 different experiments. They require no special tools and allow you to build anything from a lie detector to a diode tester. There's no English manual so this kit's quite a bit more challenging than the other Gakken kits. The pictures are fairly simple to follow,...

This little USB port go-between is like a speed gauge for your USB devices. Instead of hauling out a multimeter and splicing cables, plug this in between for a quick reading on how much current is being drawn from the port. Great for seeing the charge rate of your phone or tablet, checking your battery chargers, or other USB powered projects. There are a few USB power meters out there, The Practical Meter and the USB Spypow. We wanted something...

Make your own studded choker with an LED twist! This kit of parts comes with all the materials you'll need for a punk style LED collar. Ten juicy diffused red LEDs adorn a high-quality black leather collar that fits necks 12-15 inches (30 to 38 centimeters). Attach the included battery holder and potentiometer, used to adjust the brightness of the LEDs. The simple circuit is powered by a single CR2032 battery (we provide an extra for maximum...

The AxiDraw V3  from Evil Mad Scientist is a simple, modern, precise, and versatile pen plotter, capable of writing or drawing on almost any flat surface. It can write with your favorite fountain pens, permanent markers, and other writing implements to handle an endless variety of applications. Its unique design features a writing head that extends beyond the machine, making it possible to draw on objects bigger than the machine...

The most useful tool we've ever laid our hands on.  We thought we'd use them just for electronics but then we got our hands on these calipers and had so much fun we started measuring  everything. They're indestructible - which is good because we don't know what we'd do without them - and ultra precise which is super helpful when measuring components or when trying to decide what diameter blueberry you prefer the...

Bosch has stepped up their game with their BMP280 sensor, an environmental sensor with temperature, barometric pressure that is the next generation upgrade to the BMP085/BMP180/BMP183. This sensor is great for all sorts of weather sensing and can even be used in both I2C and SPI! This precision sensor from Bosch is the best low-cost, precision sensing solution for measuring barometric pressure with ±1 hPa absolute accuraccy, and...

This precision sensor from Bosch is the best low-cost sensing solution for measuring barometric pressure and temperature. Because pressure changes with altitude you can also use it as an altimeter! The sensor is soldered onto a PCB with a 3.3V regulator, I2C level shifter and pull-up resistors on the I2C pins. NEW! We now have a fully 5V compliant version of this board - a 3.3V regulator and a i2c level shifter circuit is included so you can use...

Fans of the BMP085/BMP180 will want to take a look at the new BMP183 - an SPI spin on the old familiar classic. This precision sensor from Bosch is the best low-cost sensing solution for measuring barometric pressure and temperature. Because pressure changes with altitude you can also use it as an altimeter! The BMP183 is the next-generation of sensors from Bosch, and is the fraternal twin of the BMP180 - with a low altitude noise of 0.25m and...

This precision sensor from Bosch is the best low-cost sensing solution for measuring barometric pressure and temperature. Because pressure changes with altitude you can also use it as an altimeter! The sensor is soldered onto a PCB with a 3.3V regulator, I2C level shifter and pull-up resistors on the I2C pins. The BMP180 is the next-generation of sensors from Bosch, and replaces the BMP085. The good news is that it is completely identical to the...