1IP65 waterproof and dustproof design, can withstand a drop of 2 meters 2LPF low-pass filtering for accurate voltage, current and frequency measurements on variable speed motor drive systems and other equipment with high electrical noise 3With built-in thermometer for easy temperature reading, no need to carry another temperature measuring instrument with a resolution of 0.1 4There is a flashlight on the top of the fuselage, and the screen comes with a backlight, which is good for working in poor lighting areas. 5True RMS AC voltage and current measurement for accurate measurement of nonlinear signals