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Do you want to improve your efficiency? Even in dark environment, it still can accurately find the AC and detect Zero line and FireWire ? Meterk's Test pencil can help you easily to point where then test where. The pen nib uses a humanized design that will protect your skin free of a sharp and accidental injury. Using the design of the insulator, it doesn't need to pass through the body to form a loop to detect whether the Fire line or not, We can test a wider range of 12-1000V which more accurate.Note:* The product may send alarm signals on the place which generates static electricity. It is a normal phenomenon, please feel easy to use. * With 12 months worry-free product guarantee and provide friendly support. Specifications: AC Voltage Range: 12-1000V Frequency: 50/60Hz Alarm Mode: Sound and light alarm Auto Shutdown: Yes Low Battery Indication: Yes Power Supply: 2 * 1.5V AAA Batteries Service Temperature: 0-40℃ Storage Temperature: -10-50℃ Item Size: 15.5 * 2.5 * 2cm / 6.10 * 0.98 * 0.79in Item Weight: 33g / 1.16oz Package List: 1 * Voltage Tester 1 * User Manual Meterk is committed to providing customers with a better use experience, more secure products, more efficient which bring you and your friends greater convenience.