Frosted Case & Function Keys: Non-slip & Comfortable grip. Quality Material: Made of quality ABS material, more and provide fast accurate measurement. Backlight Button: Backlight display, easy to read and does not affect the use in the dark. Separate Electrode: Easy to operate. ppt/ppm Conversion Button: The measurement unit can be according to the actual situation., Weight: 0.440924524 pounds, Manufacturer: Hipzeepo