Vaisala HM41 HUMICAP® Hand-Held Humidity and Temperature Meter is an ideal everyday spot-checking tool for HVAC professionals. It is compact, portable and provides reliable measurements in a wide range of applications from structural moisture measurement and air conditioning systems to  industrial production and life science applications.  HM41 model is part of the HM40 Series that includes the following models: HM41, HM42, HM45, and HM46. All HM40 models include a calibration certificate, light carrying case, and 2 x AA sized alkaline batteries (1.5V, LR6). The user interface with graphical trend display makes daily operation quick and easy with a user interface available in 10 languages. A standard ISO 9001 factory calibration certificate is included in delivery. ISO 17025 accredited calibration is available upon request. In addition to relative humidity and temperature, the HM40 Series models display five calculated humidity parameters (absolute humidity, dew point, enthalpy, mixing ratio, wet bulb), all available in both metric (°C) and non-metric (°F) units. HM41 features an interchangeable HMP113 measurement probe allowing for easy calibration (only the probe needs to be calibrated) or replacement of the probe.