Here is a multimeter that pairs with your iOS or Android device to measure voltage, current, resistance, and more. The Mooshimeter lets you add a SD card to record data for up to 6 months. It has 2 channels for simultaneous measurements. The device has a range of 100 feet.
More gadgets like this: here
The Mooshimeter ships with test leads, alligator clips, and everything you need to get started.
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