The Digi-Sense thermohygrometer indicators are designed to display temperature, humidity and time. The unique environment comfort indicator lets the user know how the level of humidity is affecting comfort, to high, low or ideal. Advanced features include °F/°C unit selection, min/max reading for temperature and humidity, environment comfort indicator, clock with alarm and date. Plus the nist-traceable Pre calibration means you get reliable measurements right out of the box, saving you time and money AO-20250-31 20250-31 has built-in temperature and humidly sensors for indoor measurements and an external temperature probe for remote monitoring of indoor or outdoor applications. What's included: built-in desktop stand, wall-mounting bracket, one AAA battery and nist-traceable calibration report with data supplied by in no cal. AO-20250-31 20250-31 also includes an external temperature probe with a 3 ft cable. Designed to gauge proper humidity levels reliable measurements, guaranteed! precalibrated to nist-traceable standards unique environment comfort indicator displays both temperature and humidly