Adafruit Large Panel-Mount Digital Power Meter - 6.5V to 100VDC up to 20A [ADA3626]
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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 out if your voltage is too low or your current draw is too high. It even does some nice calculations for you like Watts and cumulative Watt-hours. There is a small recessed button you can use to reset the cumulative measurements.
It is powered by the load it measures so wiring is very simple - two wires in, two wires out. Great for bench-top use or for embedding into your project's enclosure (note that it is meant for indoor use only.) Unlike some of our other power meters, this one requires 6.5VDC, and you cannot power it externally so it's good for higher-voltage projects not for microcontrollers.