• High measurement accuracy of ±3.0 %RH and ±0.3 °C
  • Compact with high level of IP protection
  • Large storage capacity: 16,000 data point memory
  • MIN/MAX/AVG statistical function
  • Includes HW4-lite programming / analysis PC software
  • Clear LCD display with visual alerts
  • Very long battery life (3 years at logging interval of 5 min.)
  • Conforms to FDA CFR 21 Part 11 / GAMP 5
  • Humidity sensor: ROTRONIC HYGROMER® IN-1
  • Temperature sensor: NTC
  • IP67 rated enclosure

What's in the Box

  • CR2 Battery
  • Short instruction manual
  • Function and calibration certificate
  • HW4-lite software key code


Rotronic HL-1D & TL-1D data loggers are cost-effective instruments for remotely monitoring and recording humidity and/or temperature. Both loggers feature an NTC sensor to measure temperature over a range of -20 to 70˚C with an accuracy of ±0.3°C. The HL-1D also includes a Rotronic HYGROMER IN-1 humidity sensor for making measurements over a 0 to 100% RH range and ±3.0 %RH accuracy. The internal memory records 16,000 data points which can be logged in customer selected intervals from 30 seconds to 24 hours.

Rotronic HL-1D & TL-1D data loggers are housed in an IP67 rated enclosure. The two-line LCD display shows real-time or stored values and makes setting up the instrument a snap. The installed battery can last up to three years at a logging interval of 5 minutes.


This product can be used in the following applications:

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