SINOTIMER N-72V AC Voltage Signal Indicator Square Turntable LED Digital Display Voltmeter 1. Application: panel voltmeter is widely used in electrical power, telecommunication, machine tool, ship, textile, printing, mining machinery and other industries 2. Made of plastic, durable and wear-resistant 3. High brightness LED display, measurement results intuitive display 4. Digital voltage measurement field with signal display, can be used as a signal display, alarm signal, accident signal 5. Built-in wiring screws, safe and convenient to use, solid structure, suitable for long-time work 6. Professional practical design, beautiful appearance, easy to carry and use 7. When there is no signal input, prompt message: display 000 8. 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 Parameters: 1. Input voltage: AC 220V 2. Voltage measurement range: AC 50-500V 3. Frequency compatible range: 50-60hz 4. Accuracy: 2 percent +- V 5. Display resolution: 1V 6. Sampling rate: about 1 times 7. Input circuit power consumption: less than 2VA 8. Ambient temperature: -25-55 degrees celsius 9. Product size: 73 x 73 x 52mm 10. Installation aperture: 68 x 68mm