"Features: 1. Move the NCV sensing probe along a single line to test, and the voltage alarm disappears when the circuit at point d is detected to be turned off. p> 2. Non-contact direct measurement, convenient for measurement in different environments. 3. After power on, press the sensitivity/phase sequence/ Switch the flashlight button within 1 second until the screen displays the P symbol and enter the phase sequence detection state. 4. In a dark or dim environment, long press the flashlight button to start the flashlight independently Function, convenient for actual detection operation. 5. No button operation, no induction signal, it will automatically shut down after about 3 minutes. Description: This tester is sensitive, safe and durable, and Ada is suitable for household socket testing. Features: Brand: HABOTEST Model: HT100P Power Supply: 2 x 1.5 VAAA Batteries < /p> Size: 157mm*27mm *23mm Voltage detection range: High sensitivity: AC12~1000V; Low sensitivity: AC48~1000V Frequency: 50 /60 Hz Alarm mode: sound and light alarm Package contains: 1 * Meter detector phase (included without battery) < p> Notes: 1. Please allow 0-1 inch error due to manual measurement. Thank you for your understanding. 2. The monitor is not calibrated Again, the color of the item shown in the photo may vary slightly from the actual item."