HygroPalm 21 Handheld Hygrometer

Highly accurate handheld indicator

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The HP21 is a highly accurate handheld indicator that displays relative humidity, temperature and dew or frost point temperature. The HP21 is perfect for spot checking HVAC installations, manufacturing or storage areas and any ambient air measurement within the temperature range of -10 to 60°C (14 to 140°F). The HP21 is designed to meet a wide range of user requirements from the most basic applications to the most demanding applications.

The HP21 indicator offers an extensive set of settings and functions that can be configured and enabled by the user with the ROTRONIC HW4 software. In spite of its high end design, the HP21 is ideal even as a simple humidity and temperature indicator.


  • Range of measurement: -10 to 60°C / 0 to 100 %RH
  • Accuracy at 23°C 1 %RH, 0.2 K
  • Adjusted at 23°C and 10, 35, 80 %RH
  • Service interface (UART)
  • Calculation of dew and frost point
Dimensions274 x 72 x 35 mm
Operating range electronics-10…60 °C / 0…100 %RH
Accuracy at 23 ±5 °C±1.0 %rh / ±0.2 K
Accuracy w. adjustment profile "standard"at 23 °C / 10, 35, 80 %rh ± 1.0 %rh / ± 0.2 K
Measuring range with integrated probe-10…60 °C / 0…100 %RH
Power supply / Power consumption9 V battery / ~5 mA (without lighting)
Long-term stability sensor<1 %rh / year
Humidity sensorHygromer M1-R
Temperature sensorPT100 1/3 DIN Class B
Probe protectionPolycarbonate plastic cage, black
Response time t 63<3 sec.
Allowed wind speed40 m/s, with filter
Psychrometric calculationsDew or frost point
Calibration / adjustmentwith keypad
Reproducibility Airchip<0.02 %rh / 0.01 K
Initialisation timeTypically <3 sec.
Measurement interval2 seconds
Display typeGraphic display. Display freely configurable
Alarm indicatorsYes
Battery indicatorYes
Exploitation softwareROTRONIC HW4.2
Menu guidanceYes
Trend indicatorYes
Probe adjustment by softwareYes, with service cable
Firmware updateWith internet and HW4 software
User informationfrom Software HW4 (devicemanager)
Data processing via HW4Graphs, statistics, analysis, qualification, etc.
Device Protection by passwordYes
Service InterfaceMini USB (UART)
Max. cable length service cable5 m
Enclosure materialABS
IP protection ratingIP40
Fire protection classUL94-HB Compliant
FDA/GAMP compatibilityFDA 21 CFR Part 11 and GAMP compatible

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