1. Measurement range: 5V - 100V
2. Power supply range: 5V - 100V
3. Minimum startup voltage: 3.8V
4. Allowable error: ±1%
5. Input impedance: greater than 100 kiloohms
6. Working current: red less than 15mA, green less than 12mA, blue less than 12mA
7. Refresh rate: about 300ms per cycle
8. Display mode: three-digit circular LED digital tube
9. Lead length: 20cm
10. External size: diameter 3.38cm
11. Opening size: diameter 3cm
12. Operating temperature: -10℃ - 65℃