The Model 993 combines a precis ion hygrometer and bimetallic actuated thermometer that will stand on a table or desk or hang on the wall. The 31/8" dial is color coded to show comfortable humidity and temperature conditions. Polished brass case with folding easel stand and wall hanger. Range: 0 to 100% RH and 20 to 110°F, Accuracy ±4% RH and ±1% of full scale of the temperature. Graduation 2% RH and 2°F.