The Extech RH520B Humidity and Temperature Paperless Chart Recorder with Detachable Probe provides simultaneous digital/graphical display of relative humidity, temperature or dew point, and shows date/time and Min/Max values. Use free PC-based software for data transfer to a PC and to graph %RH, Temperature, Dew Point, Wet Bulb, and GPP or g/kg. Audible and visual high/low alarm limits can be set for humidity and temperature. Ideal for buildings and conference rooms, laboratories, pharmaceutical, cleanrooms, hospitals, food storage facilities, refrigeration, hydroponics, and green houses.