With the HT Automatic Digital Multimeter's Smart Auto Mode, it lets you quickly switch between all measurement tasks, including AC voltage, resistance and continuity, without having to select a mode or range. It makes measurement work simple, fast and accurate Digital Multimeter Completely safe non-contact voltage testing with visual and audible alarms; a time-saving and safe feature. TM-510 Digital Multimeter External Silicone Cover protects automatic digital multimeters from damage and potential electric shock You can use the digital multimeter TM-510 to intelligently measure voltage on AC power lines without connecting wires, making lines troubleshooting much easier Has passed CE and RoHS certification. Overload protection measures are adopted inside the instrument to improve the security performance of the product and maximize user security. The electric automatic digital multimeter supports data retention, automatic shutdown, low battery indicator, backlight display, and flashlight functions. All these convenient features make this instrument adequate for daily use by hobbyists, car owners, and homeowners. Simple and easy to use, enjoy endless fun. voltage: 0.8-600V (: 610V)AC Resistance: 600kΩ Count: 2,000 counts NCV: Yes Display with gear display: Yes Data retention: Yes Backlight: Yes Light: Yes LowIndication: Yes Auto Power Off: Yes Material: ABS Power Layer: 2x1.5V AAA (not included) how to use: Step 1. Please remove the rubber cover on the back of the multimeter, open the battery back cover, and put 2 AAA battery into the battery compartment according to the polarity marks. Replace the battery cover. Step 2. Turn on the multimeter, insert the test leads according to the prompts, and enter the test after contacting both ends of the test leads for calibration.