15 PCS 0.28 Inch Digital DC Voltage Meter Module (tiny Voltmeter)

Description:
0.28 Inch 2 Wire Digital DC Voltage Meter Module is a tiny  DC digital voltmeter which displays DC voltage 0-40V. It is the latest voltmeter design, which breaks the conventional voltmeters. It can work directly in 5V, 9V, 12V, 24V and other circuits without voltage regulation. It is a very useful utility to monitor health and safety status of any special power supply such as the storage battery’s voltage in motorcycles and cars and also can grasp the storage battery’s status.
It can measure any DC power supply voltage up to 40V, with reverse connection protection function, so can be used as a power supply panel meter, simply. But recommended to leave enough margin when working, to avoid voltmeter’s permanent damage because of an electrical spark, power supply ripple, or other too high abrupt change of voltage. The maximum input voltage of the 2-wire cannot exceed 40V, otherwise there is a danger of burning. But another type of this voltmeter with three-wire can tolerate voltage up to 100V DC. While working, the power supply is not needed, direct use of the test voltage as a power supply, the red wire is to connect to the positive pole, the black wire is to connect to the negative pole, of course without worrying about any connection mismatch of the wires, because it has reverse polarity protection. The color display options are red, yellow, blue, green. 
 
Features:
Low working voltage: +4.0V
Maximum working voltage: +40V
Working temperature: -10 ~ +65℃
Working humidity: 10 ~ 80% (no condensation)
Working pressure: 80 ~ 106kPa
No direct exposure to sunlight

Package Include:
15 x Voltage Meter