LED Digital Voltmeter 22mm Round LED Indicator Pilot Lamp AC 60-500V Volt Mini Voltage Tester Meter Monitor Power. Lighting source: LED; Lamp colors: red, yellow, green, blue, white; Volt: 60V - 500V; Power nature: AC power; Rated temperature: T90; Continuous working life: above 30000 hours. Main technical parameters: Environmental temperature: -25+55; Vibration frequency 2-80Hz, acceleration 0.7g; Relative humidity of the air: ≤ 98%; Pollution level: level three; Installation category: level three; Protection level: IP65 for the head; Operating frequency voltage: 2.5kV (AC RMS), 1min; Leakage index: CT1 ≥ 100; Frequency: AC 50-60Hz; Error ± 1%