This tester is designed to have no serviceable parts and is maintenance free. Periodically wipe the tester with a soft damp cloth and mild household cleaner. Do not use abrasives of solvens. Ensure that no water gets inside the equipment to prevent possible shorts and damage.

Specifications
Voltage Range: 50 - 1000VAC
Frequency range: 50 - 500Hz
Bright LED and audible alarm sound if voltage is present

Measuring range: 70~1000VAC, at 50/60Hz
Alarm: Vibration and red light
Length: 62mm