Rotronic HygroLog HL-1D

Humidity and temperature data logger. Compact, dependable and inexpensive.


The HL-1D is a compact, low cost data logger capable of ±3.0 %RH and ±0.3°C accuracy. The internal memory can store up to 32,000 data points and includes the HW4-Lite software.


  • High measurement accuracy of ±3.0 %RH and ±0.3 °C
  • Compact design with a high IP protection
  • Large storage capacity: 32,000 data point memory
  • Programmable start and stop time with the HW4 software
  • MIN/MAX/AVG statistical function
  • Includes HW4-lite programming and analysis software
  • Clear LCD with visual alerts
  • Appropriately long battery life (up to 3 years)
  • FDA 21 CFR Part 11 / GAMP 5 conform software HW4


Dimensions90 x 60 x 23 mm
Weight85 g
Range of application-20…70 °C / 0…100 %RH
Accuracy at 23 ±5 °C±3.0 %RH / ±0.3 °C
Power supply / Power consumption1x CR2 battery
Battery life3 years (at a logging interval of 1 h)
Humidity sensorROTRONIC HYGROMER® IN-1
Temperature sensorNTC
Measurement interval30 s…24 h
Display typeLCD, 2 lines, resolution 1 decimal
Display refresh rate5 sec. (Standard)
(when logging same refresh rate as log interval)
LED indicator2 LEDs
Right LED flashes green during data logging
Left LED flashes red when alarm limits breached or low battery
Battery indicatorYes
HW4 compatibleV3.4.1 and higher
Storage capacity32,000 data point memory (RH & T)
Communication interfacesMini USB
IP protection ratingIP67
FDA/GAMP compatibilityFDA 21 CFR Part 11 / GAMP 5 conform software HW4
AdjustmentHumidity 1-point


Datasheet (PDF)

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