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
Dimensions 274 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 consumption 9 V battery / ~5 mA (without lighting)
Long-term stability sensor <1 %rh / year
Humidity sensor Hygromer M1-R
Temperature sensor PT100 1/3 DIN Class B
Probe protection Polycarbonate plastic cage, black
Response time t 63 <3 sec.
Allowed wind speed 40 m/s, with filter
Psychrometric calculations Dew or frost point
Calibration / adjustment with keypad
Reproducibility Airchip <0.02 %rh / 0.01 K
Initialisation time Typically <3 sec.
Measurement interval 2 seconds
Display type Graphic display. Display freely configurable
Backlight Yes
Alarm indicators Yes
Battery indicator Yes
Exploitation software ROTRONIC HW4.2
Menu guidance Yes
Trend indicator Yes
Probe adjustment by software Yes, with service cable
Firmware update With internet and HW4 software
User information from Software HW4 (devicemanager)
Data processing via HW4 Graphs, statistics, analysis, qualification, etc.
Device Protection by password Yes
Service Interface Mini USB (UART)
Max. cable length service cable 5 m
Enclosure material ABS
IP protection rating IP40
Fire protection class UL94-HB Compliant
FDA/GAMP compatibility FDA 21 CFR Part 11 and GAMP compatible

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