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Mini Power Meter with Voltage, Current, Watts, mAh & mWh Display : ID 3624 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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USB Charger Doctor - In-line Voltage and Current Meter : ID 1852 : $7.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Powerwerx Watt Meter Plus, DC Inline Power Analyzer, 75A Continuous, 8 Gauge, Bare Wire Ends | Powerwerx
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