Adopt electromagnetic w-ave sensors, it is suitable to measure the object which thickness is greater than 20mm, and the area of the object need be greater than 40*40mm. and units conversion function, you can change the units quickly for your different needs. Ambient temerature and humidity detection function: With the temperature and humidity sensors to detect the ambient temperature and humidity for you. Over-range alarm function: When the detect value of drywalll and masonry > 70% , and when the detect value of softwood and hardwood>17% , the b-uzzer will warning. This mositure detector with four measurement modes: Drywall pattern, masonry pattern, softwood pattern, hardwood pattern, this tool also can be used for other materials., Manufacturer: MMHHHG