Fangrui Product Details 1. Sinotimer N-72v Ac Voltage Signal Indicator Square Turntable Led Digital Display Voltmeter 2. Application: Panel Voltmeter Is Widely Used In Electrical Power, Telecommunication, Machine Tool, Ship, Textile, Printing, Mining Machinery And Other Industries 3. Made Of Plastic, Durable And Wear-resistant 4. High Brightness Led Display, Measurement Results Intuitive Display 5. Digital Voltage Measurement Field With Signal Display, Can Be Used As A Signal Display, Alarm Signal, Accident Signal 6. Built-in Wiring Screws, Safe And Convenient To Use, Solid Structure, Suitable For Long-time Work 7. Professional Practical Design, Beautiful Appearance, Easy To Carry And Use 8. When There Is No Signal Input, Prompt Message: Display 000 9. This Product Is Prohibited For Frequency Conversion, High Frequency, Inverter, Harmonic Interference Signal Strong Power Environment, Applicable To Sinusoidal 50-60hz Ac Frequency Utility Power 10. Parameters: 11. Input Voltage: Ac 220v 12. Voltage Measurement Range: Ac 50-500v 13. Frequency Compatible Range: 50-60hz 14. Accuracy: 2 Percent +- V 15. Display Resolution: 1v 16. Sampling Rate: About 1 Times 17. Input Circuit Power Consumption: Less Than 2va 18. Ambient Temperature: -25-55 Degrees Celsius 19. Product Size: 73 X 73 X 52mm 20. Installation Aperture: 68 X 68mm