MakerFocus 4pcs 186 50 Charging Board Dual USB 5V 2.4A Mobile Power Bank Module 186 50 Lithium Battery Charger Board with Overcharge Overdischarge Short Circuit Protection DIY USB Power Bank Board

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Main Specifications:

CALIBRATABLE: The screw on the back is used to Calibrate the meter
NOTE: When measured voltage is larger than 30V, the voltmeter will be damaged.

Overall Dimension: 23mm x 15mm/0.9" x 0.59", Thickness: 10mm/0.39"
Mounting Hole Center Distance: 28mm
Measure Voltage: DC 0~30V
Working Voltage: DC 3V-30V
Measurement Accuracy: 0.01(0.01 - 9.99V) / 0.1(10.0 - 30.0V);
Display: Three 0.36" digital LED Tube
Display Color: Blue
Measurement rate: 300mS / times
Operating Temperature: 14 ~ 149 °F(-10 ~ 65 °C)
Reverse protection: Yes
When measured voltage is below 10V: the voltmeter displays two decimal digits, for example, 5.32V
When measured voltage is larger than 10V, the voltmeter displays one decimal digit, for example, 10.5V

Wiring:

Red wire: Power supply +
Black wire: Power supply -, Measured Voltage -
White wire: Measured Voltage +

Package Includes:
5x DC 0-30V Voltmeter

This is Three-Wire Voltmeter. Three-Wire connection enable the Voltage Test Rang from 0.00 to 30V. (Two-wire meters cannot measure the voltage that is below 3V);
Measurement Accuracy: 0.01(0.01 - 9.99V) / 0.1(10.0 - 30.0V); And the meter is CALIBRATABLE: The screw on the back is used to Calibrate the meter.
BRIGHT & NICE Reading: Display: Three 0.36" digital LED Tube; Display Color: BLUE;
Reverse Polarity Protection: The meter won't burn out if reverse polarity is applied, but the screen will display nothing
NOTE: When measured voltage is larger than 30V, the voltmeter will be damaged.

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