1.【MULTIPLE PROTECTIONS】: Equipped with double ceramic fuses and circuit protection thermistor to protect the multimeter from burns.High voltage protection is active in all ranges.Double insulation: insulating body and protective silicone sleeve that protect the instrument from damage caused by drops or electric shock. 2.[Wide application]: Test basic electrical problems of cars or household appliances, suitable for electrical circuits, home users, enthusiasts, electricians and professional technicians.They can be used for household sockets, distribution boxes, fuses, cables, universal batteries, automobile batteries and charging systems, automobile circuits, etc. 3.Easy to Use】: Choose the function you want to test (make sure the rotary switch is set to the correct test range) and connect the test leads.Data hold function for quick reading, backlight for testing clearly in dark place. 4.【Multifunction: Can measure AC/DC voltage, DC current, resistance, diode, HFE, continuity and square wave output. 5.【Portable Design】: It is small and can be put in a pocket, easy to carry.