Checking humidity levels in building services or HVAC systems needs more than just an RH percentage reading — dew point matters too, since that's where the risk of condensation begins. Absolute humidity and wet bulb temperature are also important for psychrometric calculations, particularly useful when commissioning air handling systems. The Si-HH3 measures and calculates all of these from a single probe, with a free app showing readings on a connected phone.
The built-in thermo-hygrometry probe measures temperature from -20°C to 60°C, RH from 0 to 100%, and calculates dew point down to -40°C, alongside absolute humidity, wet bulb temperature and enthalpy. A two-line backlit LCD shows the readings clearly, and a magnetic backing holds the instrument in place on a metal surface in a plant room or AHU enclosure while readings stabilise.
The battery life is rated at 250 hours from three AA batteries, useful for long stretches of monitoring or multiple sites in a short space of time. It's UKCA and RoHS II compliant.
Most basic hygrometers give only RH and temperature, but the Si-HH3 calculates dew point, wet bulb temperature and the rest automatically, saving the manual psychrometric calculations that would otherwise be needed. A 250-hour battery life is genuinely useful for long monitoring stretches or multiple sites in a day, and the magnetic backing means it can be left in place in an AHU enclosure or plant room while readings stabilise, rather than needing to be held throughout.
Order the Sauermann Kimo Si-HH3 Thermo-Hygrometer online today.
| Brand | Sauermann / Kimo |
|---|---|
| Model | Si-HH3 |
| Probe Type | Built-In Integrated Thermo-Hygrometry Probe |
| RH Range | 0.00–100.00% RH |
| Temperature Range | -20.00°C to 60.00°C |
| Dew Point Range | -40.00°C to 60.00°C |
| Absolute Humidity Range | 0.00–600.00 g/m³ |
| Calculated Parameters | Dew Point, Wet Bulb, Absolute Humidity, Enthalpy, Mixing Ratio |
| Display | 2-Line Backlit LCD |
| IP Rating | IP20 |
| Units | °C, °F, % RH, °Ctd, °Ftd, °Ctw, °Ftw, g/m³, g/kg, kJ/kg |
| Battery | 3 x AAA LR03 1.5V Alkaline |
| Battery Life | 250 Hours |
| Instrument Dimensions | 70 x 33 x 228mm |
| Weight | 200g |
| Operating Temperature | -10°C to 60°C |
| Storage Temperature | -20°C to 70°C |
| Certifications | UKCA, RoHS II, RED |
| Included | Instrument, 3 x AAA Batteries, Certificate of Conformity, Quick Start Guide, Carrying Bag |
