●产品描述：
Wall Mounted Hygrometer
Measures the percentage of humidity by comparing wet and dry temperatures. A reading of humidity is reached by the use of two hygrometers, one "dry"the other "wet". An accurate reading of humidity is reached by comparing readings to the enclosed chart. Suitable for use in offices, computer rooms, grain stores, green houses and where a constant humidity measurement is necessary. Moulded plastic casing, spirit filled.
Size 300 x 72mm. Range: -5C to 50C. 20F to 120F