White Accutemp ThermoHygrometer is a household Temperature & Humidity indicator designed to show room temperature with +/-1% accuracy & relative humidity with +/-4% accuracy on continuous basis. Accutemp is mfg in a world class environment with a unique Bi-metal mechanism which works without any power supply or batteries. The gauge need calibration every year with a simple screw driver. The product can be wall mounted on a screw.