1.Thanks to its smart auto mode, TM-510 4000 counts smart digital multimeter allows you to quickly switch between all measurement tasks, including AC/DC voltage, resistance, and continuity, without selecting a mode or range. It makes measuring work easy, fast, and accurate. 2.Completely non- voltage test with a visual and audible alarm; a time-saving and feature. The outer silicone cover protects the automatic digital multimeter from damage and potential electric shock. 3.You can measure the voltage on the AC wire without having to connect the wire, which makes troubleshooting the line much easier. CAT II 600V, CE, and RoHS certified. Overload protection measures are used inside the instrument to improve the product's performance and maximise users' . 4.Supports data hold, automatic shutdown, low battery indicator, backlight display, and flashlight. All these convenience features make the instrument more than enough for daily use by amateurs, car owners, and homeowners. Easy to use, enjoy endless DIY fun.