The Extech RH520B is a paperless chart recorder that displays %RH, temperature, or dew point in both digital and graphical formats, as well as date/time and min/max values. Use the free PC-based program to upload data to a computer and graph percent RH, temperature, dew point, wet bulb, and g/kg or GPP. Humidity and temperature alarm thresholds can be set using both audible and visual indicators. This recorder is perfect for monitoring temperature and humidity in storage facilities, greenhouses, laboratories, and other buildings.