Extech RHT30 USB Humidity/Temperature Datalogger

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  • Monitor air temperature from -30˚C to 70˚C and humidity from 0.1% to 99.9%
  • Internal memory for 48,000 readings with time-and-date stamps
  • Easily export data to a PC in Excel or PDF format via integrated USB stick

rrp £91.03

now £76.50 (Ex. VAT) £91.80 (Inc. VAT)

rrp £91.03


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  • Description

    Extech RHT30 USB Humidity/Temperature Datalogger

    The Extech RHT30 USB Humidity/Temperature Datalogger is a clever, compact instrument that is capable of monitoring atmospheric conditions and then easily transferring findings to a PC. It can measure air temperature from -30˚C to 70˚C with ±0.5˚C accuracy and relative humidity from 0.1% to 99.9% with ±3% RH.

    Up to 48,000 readings can be saved to the Extech RHT30’s internal memory (24,000 temperature; 24,000 humidity) and the user can set a sampling interval of between 30s and 2 hours, thus making the datalogger ideal for short- or long-term, intensive or extensive monitoring. Readings have time-and-date stamps and the user can bookmark up to 8 recording locations.

    In terms of viewing information, the Extech RHT30 has a digital screen, data hold, adjustable LED high/low alarms, and min/max recording. Transferring data to a PC is easy thanks to the integrated USB stick and reports can be produced in both PDF or Excel format with raw data and graphical analyses.

    The Extech RHT30 offers a choice of six different languages and has a battery life of approximately three months. It comes supplied with batteries, a USB cover/stand, a wall mounting screw, and a built-in hanger.

    Key Features

    • Air temperature range: -30˚C to 70˚C
    • Humidity range: 0.1% to 99.9% RH
    • 48,000-reading internal memory
    • 3-month battery life
    • Bookmark 8 recording locations
    • High/low alarms & min/max recording
    • Integrated USB stick
    • Produce reports in PDF or Excel format
    • 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)
    • Datalogging interval: 30 seconds to 2 hours
    • Memory: Temperature: 24,000 points; Relative Humidity: 24,000 points
    • Dimensions/Weight: 4.3x1.6x0.75" (110x40x19mm)/ 1oz (90g)
  • Supplied Accessories

    • Extech RHT30 USB Humidity/Temperature Datalogger
    • 2 x CR2032 batteries
    • USB cover/stand
    • Wall mounting screw
    • Built-in hanger
    • Instructions for Extech RHT30
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  • Delivery Information

    At we understand the importance of a reliable delivery service when shopping online. Especially when the goods are often essential to your working day. If your goods are required by a certain date please feel free to contact us for an honest and realistic indication whether this can be met. We aim to process all orders we receive within 1 to 3 working days, however from time to time we do have an increased demand for certain products or there might be delays from the manufacturer. In such cases delivery of your equipment may be subject to a minor delay.

    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.