ITEM NAME:Car Auto Blue USB charging voltage voltmeter DC voltage detector 3-7.5V A5C7 Car Auto Blue USB charging voltage voltmeter DC voltage detector 3-7.5V A5C7 Simple and rapid measurement of the voltage on the USB interface and the operating current of the device. Accuracy of measurement: Tension 10 mV, the current of 1 mA Easy to carry, easy to plug and play, no external power or other accessory required. To detect whether the output voltage / current output USB charger reaches or not the norm. Color: Blue Material:ABS Weight: Approx 54 x 34 x 5 mm Interface: USB interface Digital display: Tension / Kitchen Current: 3-7.5V DC voltage, current error measurement power working temperature 0 °C - 60 °C Upper taken: to measure voltage charger cell phone, etc. 1 x Car voltmeter Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/-1-3cm.