Power / Measurement

This breakout board will solve all your power-monitoring problems. Instead of struggling with two multimeters, you can just use the handy INA219 chip on this breakout to both measure both the high side voltage and DC current draw over I2C with ±1% precision. Please Note: As of Sept 2022, due to the severe chip shortage, we've had to update this design to use...

Put a voltage meter anywhere with this very handy display. These are often used by RC hobbyists for keeping track of batteries but we thought it would be great on a breadboard or enclosure. This is the 2-wire version of the volt meter, two wires are used to power it and measure at the same time. We also have a 3-wire version that measure a wider range of voltages....

Put a voltage meter anywhere with this very handy display. These are often used by RC hobbyists for keeping track of batteries but we thought it would be great on a breadboard or enclosure. This is the 3-wire version of the volt meter, two wires are used to power it and the third wire is used for measurement. We also have a 2-wire version that measure it's own power...

Put a voltage meter anywhere with this very handy display. This panel meter simply connects to whatever DC supply you are trying to track, easy to wire up! Simply connect the red wire to the positive supply, and black to negative ground. The display has a microcontroller that will read the voltage, compare it to a stable reference and display the voltage with 0.1V...

Put a current meter anywhere with this very handy display. This panel meter requires a DC voltage to run, and then has two thick gauge wires to measure current draw. A shunt is already on board so its very easy to hook up! Since current sensors are a little more complex than volt meters, and its easy to confuse the wires, please read carefully to understand how to...

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...

This USB In-Line Voltage and Current Meter with OLED Display is a lot like the Charger Doctor we carry - if the doctor was a talented surgeon who just lost her medical license and has nothing to lose. Just like the charger doctor, you can use this meter to find out if your voltage is too low or your current draw is too high. Use the USB In-Line Voltage and Current...

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...

Everyone has that "good charger" in the house, the one that seems to get your phone from 4% to 100% in record time. But it's a bit of a mystery isn't it? Why does one charger work great while another doesn't seem to budge at all. It has to do with whether that charger supports USB Quick Charge, or Type C PD, and of course the output current ability and the length and...

Analog panel meters are arguably not as blingy or flashy as LEDs, but their simplicity adds a touch of elegance and makes them easier to read quickly. This Large 5V Analog Panel Meter is about handheld-size, with one screw to open up the panel and replace the backing paper, if you like. Even though it's designed for analog signals, you can use it with digital signals...

This small, palm-sized battery power meter has a small display that shows off how much juice is left in your single Lithium Ion/Polymer rechargeable battery. The color display has four levels of power indication once battery capacity becomes 100%, 75%, 50%, and 25%. When power is below 25%, only the red battery frame lights up. The design is pretty basic, it's just...

While this may appear to be an electronic shuriken, it's actually a Multifunctional USB Digital Tester! This handy (pun intended?) tool can measure voltage, current, power, charge time, and other measurements for USB A, Micro B, and USB C! It features a colorful display that pops up when you plug in a power supply. Each click of the button gives you a different...

Analog panel meters are arguably not as blingy or flashy as LEDs, but their simplicity adds a touch of elegance and makes them easier to read quickly. This Small -15V to +15V Panel Meter is about handheld-size, with three screws to open up the panel and replace the backing paper, if you like. It's great for analog projects that have a split power supply or large...

What do you do when you need a variety of measurements on your current project? (pun intended!) You could buy a slew of test equipment tools OR you could use this very nice panel-mount multi-function power meter! This power meter comes with a nice, big (and backlit!) LCD screen to display voltage, current, power, and energy parameters. You can use this meter to find...

Analog panel meters are arguably not as blingy or flashy as LEDs, but their simplicity adds a touch of elegance and makes them easier to read quickly. This Large 3V Panel Meter is about handheld-size, with one screw to open up the panel and replace the backing paper, if you like. Even though it's designed for analog signals, you can use it with digital signals too!...

This Mini Power Meter with Voltage, Current, Watts, mAh & mWh Display (whew that is a mouth-full) is a lot like the USB In-Line Voltage and Current Meter we carry but can be used with a wide range of voltages (not just USB connections). Measure the working voltage and current output for any project with this really fancy power meter. This power meter has a small...

Analog panel meters are arguably not as blingy or flashy as LEDs, but their simplicity adds a touch of elegance and makes them easier to read quickly. This Small -1 Amp to +1 Amp DC Current Analog Panel Meter is handheld-size, with three screws to open up the panel and replace the backing paper, if you like. Great for measuring larger bidirectional current draws,...

Help! This patient is heating up! Is the voltage too low? Is the current draw too high? Is there a doctor in the house? Oh, thank goodness, the Charger Doctor is here! Right on time...Doctor, can you tell us what the current draw is? What about the voltage? Thanks to the Doctor, you will now be able to watch and care for your USB-powered projects. Use the USB Charger...

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...