OLED USB Tester DC voltmeter current voltage 128x64 Meters Power Bank battery Capacity monitor qc2.0 Phone charger detector
OLED USB Tester DC voltmeter current voltage 128x64 Meters Power Bank
Use Power Bank regularly: Do not leave it unused for a long period. If the Power Bank for long periods
of time to be used, from time to time perform a single charge/discharge to maintain their normal performance.
Best time to discharge/charge per month of power bank, then the battery is the most effectively and trusty.
Supply Voltage: DC3-30V
DIY Supplies: Electrical
Brand Name: SJAMING
Model Number: J7-4T
Accuracy Class: +-1%
Display Type: Analog and Digital
Operating Temperature: -10~60
Measuring Range: 3-30V