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 £113.71

now £99.00 (Ex. VAT) £118.80 (Inc. VAT)

rrp £113.71

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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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    *UK mainland only

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