Features The 3-phase voltmeter has an average failure-free time of ≥50000h, and the use effect is good. Anti-corrosion, high temperature resistance, aging resistance, impact resistance. Safe and reliable to use. The programmable combined voltmeter has a compact structure, complete accessories, and is easy to install and disassemble. Using a large LED display, the reading is clearer. The maximum reading is 1999. The LED digital voltmeter has good stability and high measurement accuracy. Ensure electricity safety. The connection is stable. Has excellent temperature characteristics and power measurement capabilities. The appearance and size of the voltage and frequency tester are standard. The service life is long. Simple operation ensures high work efficiency. The failure rate is low, the work is safer, and the work efficiency can be improved. The voltage and frequency tester adopts AC sampling. It can measure electrical parameters such as current, voltage and frequency of the power grid, and set the scale through the panel buttons. Has excellent chemical stability and mechanical strength. Specification: The voltage and frequency tester adopts AC sampling. It can measure electrical parameters such as current, voltage and frequency of the power grid, and set the scale through the panel buttons. Has excellent chemical stability and mechanical strength. The 3-phase voltmeter has an average failure-free time of ≥50000h, and the use effect is good. Anti-corrosion, high temperature resistance, aging resistance, impact resistance. Safe and reliable to use. The programmable combined voltmeter has a compact structure, complete accessories, and is easy to install and disassemble. Using a large LED display, the reading is clearer. The maximum reading is 1999. Condition: 100% Brand New Item Type: Voltage Meter Voltage: AC 450V Voltage: continual1.2times, instaneous 2times/1s Accuracy Level: 0.5 Display: LED display, range from -1999 to 1999 Power Supply Voltage: AC220V Power Consumption: <5VA Insulation Resistance: ≥100MΩ Isolation Voltage: Between power supply/input/output 2kV/1min(rms) Mean Time Between Failures: ≥50000h Temperature: Work -10 ~ 55 ° C, Storage -25 ~ +70 ° C Humidity: ≤93%RH, In the place without dew and corrosive gas Altitude: ≤2000m Package List:1 x Voltage Meter 1 x User Manual Package List 1 x Voltage Meter 1 x User Manual