Heat Index Psychrometer 0 Percent to 99.9 Percent Relative Humidity Range +/-3 Percent Humidity Accuracy -4 Degrees to 122 Degrees F Wet Bulb Temperature Range -108.4 Degrees to 122 Degrees F Dew Point Range 0.1 Percent Humidity Resolution Sensor Type Capacitance Relative Humidity Sensor Battery Type CR2032 Data Hold Yes Response Time 3 sec Data Logging No