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Up to 16,000 readings for RH/Temp & user-programmable sample rate

Extech RHT20 Humidity and Temperature Datalogger

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The RHT20 is a Humidity Temperature Datalogger which records up to 16,000 Humidity and 16,000 Temperature readings with a user programmable sample rate. USB interface for easy setup and data download. Selectable data sampling rates from 1s to 24hr. User-programmable alarm thresholds for RH and Temperature. LCD displays current temperature and humidity readings plus Min/Max and Alarm status. Long battery life. Place or mount the datalogger in monitoring location (storage bin, truck, cargo hold, freezer, temperature-controlled room, etc.). Datalogger records temperature and humidity at sample rate set by user. Connect the datalogger to your PC via the USB interface to retrieve readings. Datalogger displays the current Humidity and Temperature plus Min/Max and alarm status so it can viewed anytime during the recording process. Complete with battery, mounting bracket, and software.

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  • Selectable Data Sampling Rate

    Selectable data sampling rates from 1 second to 24 hours.

  • Programmable

    User-programmable alarm thresholds for RH and Temperature

  • Long Battery Life

    Complete with 3.6V Lithium battery, mounting bracket with combination lock

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General Specifications
Datalogging Interval
1 second to 24 hours
16,000 points
Relative Humidity
0 to 100%
Relative Humidity Basic Accuracy
±3% (40 to 60%), ±3.5% (20 to 40 & 60 to 80%), ±5% (0 to 20 & 80 to 100%)
Relative Humidity Max Resolution
Temperature (Air)
-40 to 158°F (-40 to 70°C)
Temperature (Air) Basic Accuracy
±1.8°F (14 to 104°F), ±3.6°F (all other ranges), ±1.0°C (-10 to 40°C), ±2.0°C (all other ranges)
Temperature (Air) Max Resolution
Additional Details
3.7 × 1.9 × 1.2" (94.4 × 48.9 × 31.2mm)
1 × 3.6V battery
2 years
3.2oz (90.7g)
Related Documents
Export Restrictions

Export Restrictions

The information contained in this page pertains to products that may be subject to the International Traffic in Arms Regulations (ITAR) (22 C.F.R. Sections 120-130) or the Export Administration Regulations (EAR) (15 C.F.R. Sections 730-774) depending upon specifications for the final product; jurisdiction and classification will be provided upon request.

Extech RHT20 Humidity and Temperature Datalogger