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5V 1A (1000mA) USB port power supply - UL Listed : ID 501 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Voltage and Current Meter for USB Port [USB Meter] - US $7.00 : HAOYU Electronics : Make Engineers Job Easier
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USB Port Mini Discharge Load Resistor Digital Current Voltage Meter Tester 2A/1A With Switch 1A Green Led / 2A Red Led
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