Vaisala HUMICAP® Handheld Humidity and Temperature Meter HM70 measures relative humidity and temperature accurately in measurement range −70 … +180 °C (−94 … +356 °F), depending on the probe model. HM70 consists of 2 main units: Vaisala Handheld Measurement Indicator MI70 and the HMP75/HMP76/HMP77 probe.
HM70 can be used to measure the following parameters:
| Parameter | Abbreviation | Metric unit | Non-metric unit |
|---|---|---|---|
| Relative humidity | RH | %RH | %RH |
| Temperature | T | °C | °F |
| Dew point/frost point temperature 1 | Td/f | °C | °F |
| Dew point temperature 2 | Td | °C | °F |
| Absolute humidity | a | g/m3 | gr/ft3 |
| Mixing ratio | x | g/kg | gr/lb |
| Wet bulb temperature | Tw | °C | °F |
| Humid air volume/dry air volume | H2O | ppm | ppm |
| Water vapor pressure | pw | hPa | lb/in2 |
| Saturation water vapor pressure | pws | hPa | lb/in2 |
| Enthalpy | h | kJ/kg | Btu/lb |
| Water activity | aw | aw | aw |
This Quick Guide introduces the features of the MI70 indicator and the basic measurement procedure with the HM70 meter.
The HM70 User Guide (M210297EN) at www.vaisala.com/hm70 contains product specifications and instructions for operating and maintaining HM70, and using it together with the following Vaisala instruments: HMT120, HMT140, HMT330, PTU300, HMT310, and HMP155.
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