Most current meters used by scientists cost about $15,000 each, while Sheremet's meter is only about $500, and he makes each one by hand. It takes him about a week to build and calibrate 10 of them.

Adafruit has this week announced the availability of a new Mini Power Meter complete with Voltage, Current, Watt’s mAh and mWh display, which is capable of supporting a wide variety of different ...