Extech AN340 CMM CFM Anemometer/Psychrometer Data Logger

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  • Measures air flow speed from 0.5m/s to 20m/s with ±3% basic accuracy
  • Calculates air flow volume in cubic feet or cubic metres per minute
  • Records up to 12,000 data points in datalogging mode

rrp £376.08

now £289.95 (Ex. VAT) £347.94 (Inc. VAT)

rrp £376.08


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  • Description

    Extech AN340 CMM CFM Anemometer/Psychrometer Data Logger

    The Extech AN340 CMM CFM Anemometer/Psychrometer Data Logger is capable of measuring wind speed from 0.5m/s to 20m/s; air temperature from -20˚C to 60˚C; and humidity from 0.1% to 99.9% RH. It can also calculate wet bulb and dew point values as well as cubic metres per minute as a volume flow reading.

    Measurements are taken via the Extech AN340’s 18mm diameter rotating vane probe that is attached to the anemometer via a 1m cable. There are various measurement functions such as min/max/average and data hold and it has internal storage for up to 99 readings.

    In datalogging mode, the Extech AN340 can connect to a PC over a USB connection and saves up to 12000 readings with time and date stamps. The sampling rate is adjustable between 1s and 5-hour intervals.

    The Extech AN340 comes supplied with an external mini vane probe, Windows compatible software, USB cable, six AAA batteries and hard carry case. It is supplied with a one-year warranty.

    Extech part number: AN340

    Key Features

    • Air flow velocity: 0.5m/s to 20m/s
    • Air temperature: -20˚ to 60˚C
    • Humidity: 0.1% to 99.9%
    • Wet bulb & dew point calculation
    • CMM and CFM volume flow calculation
    • Internal memory for 99 readings
    • Min/max/avg recording
    • Saves up to 12,000 readings in datalogging mode
    • USB connection and PC interface
    • One-year warranty
  • Specification

    Air speed

    • Range: 0.5 to 20m/s
    • Accuracy: ±3%


    • Range: -20˚C to 60˚C
    • Accuracy: ±0.6˚C


    • Range: 0.1 to 99.99% RH
    • Accuracy: ±3% RH


    • Wet bulb: -20˚C to 60˚C
    • Dew point: -20˚C to 60˚C
    • CFM/CMM: 0 to 99999
    • Dimensions: 169mm x 78.3mm x 44.4mm
    • Weight: 210g
  • Supplied Accessories

    • Extech AN340 CMM CMF Anemometer/Psychrometer Data Logger
    • External mini vane probe
    • Windows compatible software
    • USB cable
    • 6 x AAA batteries
    • Hard carry case
    • Instructions for Extech AN340
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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.