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Auto Shut-down to Save Power: If the device is not operated within five minutes, it will turn off automatically Rotate the top black button on the device to quickly and easily replace the battery if the device is out of power. Dual Range Testing: Just put the sensitivity adjusted button to adjust the sensitivity ( Low, Mid High) to measure the voltage ( 48V-1000V under default situation to 12V-1000V). NCV Sensitivity Indication Mode: CE CAT III 1000V/ CAT IV 600V with an audible and visual alarm guard your safety If the instrument detects common AC signal, the lamp (low) along lights up If it detects higher AC signal, the lamp(low, mid) both lights up If it detects highest AC signal ,the lamps(low, mid, high) all lights up The buzzer makes the different alarm sound correspondingly Note: This function is designed for voltage detection in the weak electric field. With NCV function can detect objects without any AC voltage. Otherwise, it will normally beep. Specification: ●Range of AC Voltage: 48V-1000V/12V-1000V ●Frequency: 50Hz / 60Hz ●Alarm Mode: Sound and light alarm ●Voltage levels:low, moderate,high ●Electric Torch: While LED illumination lamp ●Low-voltage indicator lamp: Yes ●Power Source: 2 x 1.5V AAA Batteries ●Product Size: 6.1 x 0.8 x 0.8 inches ●Security Level: CE CAT. III 1000V / CAT. IV 600V ●Service Temperature: 0-40℃ ●Storage Temperature: -10-50℃ ●Altitude: