1. Application: panel voltmeter is widely used in electrical power, telecommunication, machine tool, ship, textile, printing, mining machinery and other industries2. Made of plastic, durable and wear-resistant3. High brightness LED display, measurement results intuitive display4. Digital voltage measurement field with signal display, can be used as a signal display, alarm signal, accident signal5. Built-in wiring screws, safe and convenient to use, solid structure, suitable for long-time work6. Professional practical design, beautiful appearance, easy to carry and use7. When there is no signal input, prompt message: display 0008. This product is prohibited for frequency conversion, high frequency, inverter, harmonic interference signal strong power environment, applicable to sinusoidal 50-60HZ AC frequency utility powerParameters:1. Input voltage: AC 220V2. Voltage measurement range: AC 50-500V3. Frequency compatible range: 50-60hz4. Accuracy: 2 percent +/- V5. Display resolution: 1V6. Sampling rate: about 1 time/s7. Input circuit power consumption: less than 2VA8. Ambient temperature: -25-55 degrees celsius9. Product size: 73 x 73 x 52mm10. Installation aperture: 68 x 68mmSpecification: Package Weight One Package Weight 0.16kgs / 0.36lb One Package Size 8cm * 8cm * 8cm / 3.15inch * 3.15inch * 3.15inch Qty per Carton 90 Carton Weight 15.50kgs / 34.17lb Carton Size 50cm * 34cm * 34cm / 19.69inch * 13.39inch * 13.39inch Loading Container 20GP: 461 cartons * 90 pcs = 41490 pcs40HQ: 1071 cartons * 90 pcs = 96390 pcs