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Digital AC voltmeter + signal indicator Input voltage: AC 80-500V Voltage measuring range: AC 80-500V Rated power: 0.5W Main body size: (length) 5cm x (φ)2.7cm/2"x1" Install opening: (φ)2.2cm/0.9" Height of the display digit: 1.1cm/0.4" Working environment temperature: -25℃- +65℃ Air relative temperature: ≤98% Application: for signal indication, warning signal, accident signal and other signals in the line of electric power, telecommunication, machine tool, ship, textile, printing and mining machinery. Package include: 3xMini Digital Voltage Tester