DROK Ultra-Small 2 Wires Voltmeter Guage White LED 0.36 Inches DC 3.0-30V Digital Volt Meter Motorcycle Car Battery Tester 5V 12V 24V DC Voltage Check Detector

Features:
Cutting size: 23mm x 14mm
Thickness: 10mm
Mounting Hole Center Distance: 28mm
Measure Voltage:  DC 3.0~30V (No Need power supply, measure Directly)
Input Polarity: DC Voltage
Measurement Accuracy: 1% (+ / - 2 digit)
Display: Three 0.36" digital LED Tube
Display Color: White
Refresh Rate: about 500mS / times
Operating Temperature: -10°c ~ 65°c
Reverse protection: have
when measure 10V below:  the voltmeter display x.xx
when measure more than 10V, the voltmeter display xx.x

Wiring:
Red: Power Supply +,Measure Voltage +,(3.0 ~ 30V DC)
Black: Power Supply -, Measure Voltage -

Some applications:
Measure 18650 batteries
Measure Cell-phone Lithium Batteries
Measure Nickel-hydride Battery Pack
Measure Cars Motorcycles Battery Voltage,Etc.

Package Includes:
1x Digital Panel Voltmeter