Voltmeter AC 70-500V 2 Wire Red LED Pane Display Voltage Meter

This voltmeter's wiring is simple, it only need to connect two wires, the red wire is to connected to positive pole, the black wire is to connected to negative pole, There is protection when the wires aren't correctly connected, the electric circuit won't be bumed.It has reverse connect protection.
This voltmeter doesn't need external drive working power, it can work with measuring voltage, the working voltage's range is70-500v
Good stability and high measurement accuracy.
With trimmer potentiometer.
Easy to read, install and use.
No need external power supply.
specification:
1. Measuring range: AC70V-500V
2. Power supply range
No additional power supply needed, direct use of the measured voltage as a power supply, range: AC70V-500V
3. Maximum input
AC500V. Note: Input voltage higher than 500V may be permanently damaged!
4. Allowable error: ± 1%;
5. Input impedance> 1M ohms
6. Working current red <23mA, green <18mA, blue <17mA
Refresh speed: About 300mS / time
7. Display mode
Three-digit 0.56" LED digital tube
8. Display color:
Red, green, blue ( optional )
9. Lead length: about: 20 cm / 7.87 in
10. Outside dimensions: about: 4.8 x 2.9 x 2.2 cm / 1.89 x 1.17 x 0.87 in
Hole Size: about 4.6 x 2.7 cm / 1.81 x 1.06 in
11. Net weight: about 18g
12. Operating temperature: -20 ° C to 65 ° C