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Extech RH350 SuperHeat Psychrometer

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  • Superheat differential measurements: T1-T2, Air-T1, T1-Dewpoint
  • Simultaneous display of External Probe Temperatures, Wet Bulb, Dew point
  • Built-in RS-232 interface uses optional Windows compatible software

rrp £127.45

now £103.00 (Ex. VAT) £123.60 (Inc. VAT)

rrp £127.45

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"Designed for accuracy in extremely cold or extremely hot conditions (superheat)"

  • Description

    Extech RH350 SuperHeat Psychrometer

    Developed to monitor humidity, air temperature and contact temperature at a high level of accuracy. This versatile instrument can be used to evaluate temperature varying from extremely cold to extremely hot also known as (superheat) applications.

    This handheld device benefits from 6 easy to operate function buttons along with a bright LCD divided into 3 relevant sections. This triple display gives users a convenient way of simultaneously observing real time humidity, air temperature and contact temperature. This feature ensures environmental engineers can get a full view of the parameters without having to perform a collection of tests.

    The primary sensor of the RH350 Psychrometer is located at the top and is used to evaluate dew point and wet bulb along with %RH and temperature. The instrument provides a twist close sensor cap ideal for protection during transportation.

    The versatility of the RH350 extends when the two supplied Type K Bead Wire Temperature Probes are connected. These probes ensure Superheat differential measurements can be accurately taken including T1-T2, Air-T1 and T1-Dewpoint. Other useful functions include a real time clock, backlit screen and the option to retrieve MAX/MIN readings with date and time stamps.

    Surveyors will gain peace of mind from the RH350’s internal memory holding 99 readings. Pairing the device via the included RS232 connection to a windows PC and Extech software (not included) opens the door for further data analysis and interaction.

    Extech RH350 SuperHeat Psychrometer Main Features

    • Superheat differential measurements: T1-T2, Air-T1, T1-Dewpoint
    • Simultaneous display of External Probe Temperatures, Wet Bulb, Dew point
    • Built-in RS-232 interface uses optional Windows compatible software
    • Dual Type K external temperature probe inputs (T1, T2)
    • Retrieve Max/Min readings with data and time plus Average function
    • Switchable °F/°C temperature units with 0.1° resolution
    • Data Hold freezes current reading on display
    • Backlighting with triple display
    • Clock shows real time
    • Protective twist sensor cap designed to keep detector safe
    • Battery life preservation with Auto power off function
    • Supplied with 2 Type K bead wire temperature probes and 4 AAA batteries
  • Specification

    Specifications Range Max Resolution Basic Accuracy


    10 to 90% RH

    0.1% RH

    ±3% RH

    Temperature (Internal)

    -4 to 122°F (-20 to 50°C)


    ±1.8°F or ±1°C

    Temperature (External)

    -328 to 2498°F (-200 to 1370°C)


    ±0.3% or ±1.8°F/±1°C

    Dew Point

    -90.4 to 122°F (-68.0 to 49.9°C)



    Wet Bulb

    -6.9 to 122°F (-21.6 to 49.9°C)




    9 x 2.2 x 1.7" (230 x 57 x 44mm)




    5.3oz (153g)



  • Supplied Accessories

    • Extech RH350 SuperHeat Psychrometer
    • 2 x Type K Bead Wire Temperature Probes
    • 4 x AAA Batteries
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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*
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    • 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:

    Test-Meter.co.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 admin@test-meter.co.uk with your name, address and the items you would like to order for an accurate shipping quote or go to http://www.test-meter.co.uk/test-equipment-export for more information.

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