SMAKN® Blue 0.28" Mini 2 Wire DC Voltmeter 2.50~30v Digital Display Voltmeter Gauge LED Voltage Detector

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Features:
Cutting size: 23mm x 14mm
Thickness: 10mm
Mounting Hole Center Distance: 28mm
Measure Voltage:Â 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: -10Â°c ~ 65Â°c
Reverse protection: have
when measure 10V below:Â 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

Two-wires connection: simply connect the red and black wire to positive and negative pole respectively
With reversed connection protection, meaning meter will not burn when connected reversely
0.36" LED digits visible display; it requires low voltage to start; if volt is less than 3.5V, the LED will dim but not affect measurement
To acquire best accuracy, its decimal point can move according to different tested voltage(if <10V, two digits show after decimal point; if>10V, 1 digit shows after decimal point)
It can test voltage of 18650 or lithium battery, NiMH battery pack, moto, auto, car, etc; screw potentiometer in back side for more accurate results

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