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Description ▲ It is used to measure the opening phase condition and order through LED and Buzzer. ▲ Measuring frequency range: 20~400Hz ▲ Operational voltage: 60~600V(3 Phase AC) Technical Specifications ▲ Operation Voltage: 60V600V AC three phase. ▲ Limit Support Voltage: 2000V/minute (impulse voltage 4000V) ▲ Operation Frequency Range: 20Hz400Hz. ▲ Limit time for Continuous Use: -60 minutes maximum at 60V AC. -4 minutes maximum at 600V AC. ▲ Dimensions: 85×64×23mm ▲ Weight: Approximately 200g ▲ Test leads: Double insulation, with approximately 1 meter length.