Features: Multifunctional Auto Circuit Tester: mainly used for the measurement of voltage, resistance, diode, circuit on/off, and it will make sound if less than 30Ω during short-circuit testing. Test Probe Hook: accurately detecting the inner line fault without removing the cable cover. Its slim shape especially perfect for operating in the narrow space with no problem. HD LCD Screen: display data clearly and intuitive, 1,999 maximum display with backlight for easily checking the readout in low-lit conditions. Illuminate Function: designed with a small LED lamp for auxiliary lighting in dark areas. Ergonomic Handheld Tester: user-friendly gear and push button to switch among various functions, easy one-handed operation and convenient for carrying with.   3 times/second Switching Rate: simply push the trigger, and the test result will show on the LCD screen, high efficiency and time saving. Auto Power-off Function: has function of automatic shutdown to save power (the function can be cancelled during use). Specifications: Material: ABS Max. Display: 1999 Switching Rate: 3 times/second Range Mode: Active combination of full-automatic or full-manual range Polar Indication: Automatic Temperature Measurement: Centigrade(℃) and Fahrenheit(℉) Working Voltage: 2.4~3.6V Low-voltage Indication: About 2.4V Buzzer Frequency: About 2.7kHz Test Lamp: DC 0~30V LEC Test Lamp: DC 0~30V Aging Wire Test Gear: DC 0~30V Feeler: All tests directly DC Voltage: 199.9mV, 1,999V, 19.99V, 199.9V, 600V AC Voltage: 199.9mV, 1,999V, 19.99V, 199.9V, 600V Resistance: 199.9Ω, 1.999KΩ, 19.99KΩ, 199.99KΩ, 1.999MΩ, 19.99MΩ Diode: 0~1.5V Short-circuit Test: Make sound if less than 30Ω Auto Power-off: Yes Power Supply: 3 * 1.5V AAA battery (NOT included) Item Size: 296 * 85 * 25mm / 11.65 * 3.35 * 0.98in Item Weight: 80g / 2.82oz Package Weight: 263g / 9.28oz Package Size: 30 * 10.5 * 3.3cm / 11.81 * 4.13 * 1.30in Packing List: 1 * Auto Circuit Tester 1 * Probe 1 * Manual (English)