ALLOSUN Portable Autorange Digital Multimeter Automotive AC DC Volt Lux Meter Sound Temp Humidy Tester DMM Digital Multimeter is the best choice you can make.In addition to basic functions, the multimeter can measure illuminance, sound level, humidity and temperature. Important! It has an auto range switch instead of a manual range. This means that you don`t have to make an effort to set up a measuring range. Just switch it to the needed mode and measure! Safe and reliable. Meets IEC61010 CATII 600V safety rating criteria , the user can test a wider range of applications and testing , and testing safer, namely to protect the user's investment , but also to ensure the safe use of personnel and equipment . Backlit LCD with large digitals for visibility in dimly lit areas and durable rubber holster against the shock of a drop Auto power off.If the meter is idle for 15 minutes (idle time), the meter automatically turns off. This protects the battery and can not be accidentally discharged