XIKAR PuroTemp Rectangular digital hygrometer has been designed for long term accuracy and minimal maintenance. They accurately display the relative humidity and temperature in your humidor. Min/Max feature displays lowest minimum and highest maximum humidity recorded over the life of the battery or until reset. Features: Accurate to +/- 2% at 70% humidity. Reads humidity in the range of 20% to 95%. Registers temperature in Fahrenheit and Celsius. Measures 2" H x 3.25" W x 0.375" D.