Extech RHT35 Humidity/Temperature/Pressure Datalogger

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  • Measures air temperature from -30˚C to 70˚C and humidity from 0.1% to 99.9%
  • Monitor barometric pressure from 300 to 1100hPa with ±3hPa accuracy
  • Saves up to 48,000 readings, exportable in Excel or PDF format

rrp £109.24

now £90.00 (Ex. VAT) £108.00 (Inc. VAT)

rrp £109.24


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  • Description

    Extech RHT35 Humidity/Temperature/Pressure Datalogger

    The Extech RHT35/Temperature/Pressure Datalogger is a clever combination of a USB pen, a thermohygrometer and a barometer, thus allowing the user to monitor several different atmospheric variables. It can measure air temperature between -30˚C and 70˚C, humidity between 0.1% and 99.9%, and barometric pressure between 300 and 1100hPa. It has an NTC thermistor, capacitive humidity sensor, and MEMS pressure sensor.

    Readings are shown on the Extech RHT35’s 5-digit display and adjustable alarms are available. Red and green LEDs indicate the datalogger’s status and it is easy to operate the unit thanks to the simple push-button interface.

    The Extech RHT35 has a 48,000-reading internal memory (16,000 each for temperature, humidity and pressure). The user can save up to 8 different locations in a recording log and reports can be exported to a PC in PDF or Excel formats with raw data and trending graphs. There is a choice of up to six different languages and the user can set a sampling rate of between 30s and 2 hours.

    The Extech RHT35 includes an integrated USB stick and has a battery life of roughly three months. It comes supplied with batteries, a USB cover, a wall mounting screw and a built in hanger.

    Extech part number: RHT35

    Key Features

    • Air temperature: -30˚C to 70˚C
    • Humidity: 0.1% to 99.9%
    • Barometric pressure: 300 to 1100hPa
    • 5-digit display
    • High/low alarms and min/max recording
    • Saves up to 48,000 readings
    • 8 different bookmarked locations
    • Exports data in Excel or PDF format
    • Sampling rate of between 30s and two hours
    • Integrated USB stick
    • One-year warranty
  • Specification


    • Range: 0.1 to 99.9%RH
    • Resolution: 0.1%RH
    • Accuracy: ±3%RH

    Temperature (Air)

    • Range: -22 to 158°F (-30 to 70°C)\
    • Resolution: 0.1°C
    • Accuracy: ±1.0°F (±0.5°C)

    Barometric Pressure

    • Range: 300 to 1100 hPa (8.9 to 32.5 inHg)
    • Resolution: 0.1 hPa (0.1 inHg)
    • Accuracy: ±3 hPa
    • Datalogging interval: 30 seconds to 2 hours
    • Memory: Relative Humidity: 16,000 points, Temperature: 16,000 points, Barometric Pressure: 16,000 points
    • Dimensions/Weight: 4.3x1.6x0.75" (110x40x19mm)/ 1oz (90g)
  • Supplied Accessories

    • Extech RHT35 USB Humidity/Temperature Datalogger
    • 2 x CR2032 batteries
    • USB cover/stand
    • Wall mounting screw
    • Built-in hanger
    • Instructions for Extech RHT35
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  • Delivery Information

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    We use DPD/Interlink for all larger items and Royal Mail for smaller items and accessories. With DPD/Interlink you will receive a 1 hour delivery window on the day of delivery via e-mail/text and a notification 15 minutes before arrival so you will not have to wait around all day. You can even manage your booking online and re-arrange delivery for another date or arrange the goods to be left with a neighbour of your choice.

    We also offer delivery options for goods required urgently on certain products, all which are sent by DPD/Interlink.

    Our charges for UK deliveries:

    • FREE Delivery (on select products only): typically 3-5 working days*
    • Standard Delivery at £4.95: 2-3 working days
    • Next Working Day Delivery (on select products only) at £7.50
    • Pre-Noon Next Working Day Delivery (on select products only) at £9.50*
    • Pre-10.30am Next Working Day Delivery (on select products only) at £18.50*
    • Saturday Pre-Noon Delivery (on select products only) at £14.50*
    • Sunday Pre-Noon Delivery (on select products only) at £14.50*

    *UK mainland only

    NOTE! For next working day or Saturday/Sunday delivery options the order MUST be placed no later than 3pm on the working day before delivery is required. After 3pm, please arrange with our staff before selecting a priority delivery service. Priority services are available to UK mainland residents only (this might exclude certain areas in the north of Scotland).

    Customers outside the UK: exports to many countries all over the world. Prices for shipping vary on location and weight/dimensions. Costs are calculated for certain countries at the checkout. If your country is not included in this list please e-mail with your name, address and the items you would like to order for an accurate shipping quote or go to for more information.

    For more information on delivery, please see our terms and conditions.