The micro HM-100 temperature and humidity meter is a professional device to accurately measure humidity and temperature. Both measured values (%RH and Ѓ or І) are displayed immediately and simultaneously on the dual backlit LCD. You can determine the indoor air quality (IAQ) at the press of a button and you can use the device to assess the operation of ventilation, air conditioning and refrigeration systems. The micro HM-100 automatically calculates the dew point and wet-bulb temperatures and the capacity sensor is resistant to the effects of condensation and high temperatures. The micro HM-100 is therefore ideal for use in demanding HVAC environments. The micro HM-100 comes in a carrying case and with a 9V battery.