Extech RH35 Desktop Radar Hygro-Thermometer Alert Innovative graphical display shows the measured humidity values of the last 24 hours like a radar screen Large, easy-to-read LCD displays % Relative Humidity, Indoor Temperature and Dew Point Basic Accuracy of 4%RH (30% to 80%), 5%RH (&lt;35% or&gt;75%), 1.8DegreeF/1DegreeC Beeper sounds and bright LED flashes when humidity level exceeds 65%RH Stores and recalls Max/Min readings