SINOTIMER ST17HZ 22mm Square LED Digital Display 50-75Hz AC Frequency Signal Indicator(03 Blue)

1. Easy to install, simple to use, no complicated steps
2. Energy saving and environmental protection, stable performance
3. Frequency range: 20-75Hz
4. Voltage range: 60-500V AC
5. Accuracy: +/- 2%
6. Ambient temperature: 0-50 degrees Celsius
7. Opening size: 22mm
8. Overall size: about 2.8 x 5.1 x 2cm