ACR Systems
$345.00 USD
Unit price per


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Economical dual-channel data logger ideal for quick, accurate temperature and relative humidity measurements in the field.

Typical applications include:

  • Hydroponic grow operations
  • HVAC system testing & balancing
  • Pharmaceutical and Lab storage monitoring
  • Building comfort monitoring

Key Features:

  • Easy to use
  • High memory capacity


Battery 3.6 volt Lithium, 1 Amp-Hour
Battery life 5 years under normal use (factory replaceable)
Calibration Factory calibration verification and NIST certificates are available upon special request.
Case Material Cycoloy® (GE Plastics) C120 ABS + Polycarbonate
Clock Accuracy +/- 2 seconds per day
Memory Size 64 KB (32,676 readings per channel)
Operating Limits -40 to 70°C (-40 to 158°F) and 0 to 95% RH (non-condensing)
PC Requirements Windows PC with a least 256MB RAM, 250MB of hard drive space and one free serial or USB port depending on interface
Resolution 8-bit (1 part in 256)
RH Sensor Accuracy +/- 4% RH between 20 and 80% RH; otherwise +/- 5%
RH Sensor Range 0 to 100% RH (non-condensing)
RH Sensor Type CMOSens® (by Sensiron)
Sampling Intervals User selectable from 8 seconds to 34 minutes; readings stored to memory can be spot or averaged over the sample interval (except for the 8 second interval)
Sampling Methods First-in First-out, Stop When Full, Delay Start, or Spot & Average
Size 25.4 mm x 58.4 mm x 81.3 mm (1″ x 2.3″ x 3.2″)
Temperature Sensor Accuracy +/- 0.6°C @ 25°C (+/- 1.0°F @ 77°F); +/- 2.0°C from -40 to 70°C (+/- 3.6°F from -40 to 158°F)
Temperature Sensor Range -40 to 70°C (-40 to 158°F)
Temperature Sensor Type CMOSens® (by Sensiron)
Weight 74 g (2.6 oz)


ACR softwares are powerful, easy and intuitive that opens a window into the analysis of your data collected. Data can be viewed in various formats and presentation quality graphs can be exported into any WORD program. The software provides electronic records for a reduced paper trail.

TrendReader Express - License TrendReader Express on USB


For a product sheet, please click below for a pdf version.

Product Sheet

A link to the Manual is available by clicking on the link below.

TRH Manual


Click here to visit our NEW Q&A pages.


Data loggers are often used in highly regulated environments such as food and pharmaceutical production and storage where strict safety regulations apply. Regulatory agencies generally require proof of calibration.

ACR calibrations are performed using reference standards that have been calibrated and are traceable to the US National Institute of Standards & Technology (NIST). This ensures that all ACR data loggers meet, and perform to, their published specifications, allowing you to be confident that they will assist you in achieving your compliance requirements.

Calibration certificates are provided with every calibration we perform. ACR Systems is an ISO 9001:2015 registered company and calibration records are kept as part of our quality system and can be made available for customer audits.

Calibration Service

Technical assistance is free for the life of the product. To speak with a member of our Support Team:

Call toll-free @ 1-800-663-7845 or email:

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