YSTD Hygrometer Thermometer Digital LCD Temperature Humidity Meter -50~70 10%~99%RH (Black) High Quality Hygrometer, wonderful tools for Indoor, Outdoor, Home, Laboratory, Library..etc. Temperature display resolution: 0.1 . Operating voltage: 2 x 1.5V button LR44 batteries (Not included) Dimension: 4.7x2.8x1.5cm(approx.) LCD dimension: 3.6x1.7cm(approx.)