Feature: 
Wiring method: 3-wire system, one total of ground! 
A circuit board power supply 4-28V! 
A voltage line end to be measured! Easy to use! 
Protection method: wrong wiring, voltmeter does not work, it will not be damaged! 

Specifications: 
Measuring range: 000.0-500.0V 
Operating temperatur: -10℃~60℃ 
Working voltage: DC4-28V 
Working current: <15mA 
Measurement accuracy: 0.5%（+/-2）*2 
Measure the impedance: 2M 
Refresh rate: 3 times/second 
Display mode:4 bit 0.28 inch LED 
Display color: Red / Blue / Green 
Overall dimensions:39.6MM*10.6MM*9.6MM(L*W*H) 
Installation hole distance: 36MM aperture 2.1MM 
Digital tube size: 32mm*10.2mm (0.28 inch 4-digit integrated digital tube) 
Lead wire length: 10CM 

Wiring method: black public negative pole, red instrument power supply, white measurement port 
*1:The instrument can work in dc4-28v, but it will be hot when it is above 15V and reduce the accuracy and life. Please use 5-15V power supply. 
*2:In the worst case, the error is no more than 2.7V. In general, the error is about 1.5V.