The Western Caliber III digital hygrometer provides temperature and humidity in a compact unit. Measures 15% - 95% RH with an accuracy of +/- 1%. Measures 40 - 92 degrees Fahrenheit with an accuracy of 1.8 degrees. Updating time of 10 seconds prevents gauge flutter. Very compact, slim profile measuring 3.5" L x 1.25" H x .25" T