Voltmeter Tester 4,5-30v (AMG63G)

This Red DC Voltage Meter with DC4.5-30V range. 
It is easy to read, install and use
And it is self-powered version and supports Reverse polarity protection.
When the voltage is under 10V, there will be 2 digits after the decimal point, which mean the accuracy is 0.01 when it is under 10V; when it is above 10v, the accuracy is 0.1
 
Parameter:
 
Measure Voltage: DC 4.5-30V two-wire access
Display: Three digit 0.56 LED, Red/Blue/Green color
Refresh Speed: Approx.300mS/time
Highest input:DC 30V (higher than 30v has the risk of burn up)
Minimum input:DC 4.5V(below than 4.5V,measurement is inaccurate
or does not show)
Minimum Resolution:0.01V(<10V)/0.1V(>10V)
Resolution:1%plusmn1digit
Working Temperature:-20℃~65℃
Size:Approx. 48mm x 29mm x 22mm(L*W*H)
Hole Size: Approx.46*27mm
Current Consumption:<23mA
LED Color: Red/Blue/Green color