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Extech RH-350 and RH-355 Kit
SuperHeat Psychrometer

  • Superheat differential measurements:
    T1-T2, Air-T1, T1-Dewpoint
  • Dual Type K external temperature probe inputs (T1, T2)
  • Simultaneous display of %RH, Temperature and
    Dew point or Wet Bulb or External Probe Temperatures
  • Built-in RS-232 interface (optional RS-232 cable) — uses
    Windows® Hyperterminal to download data to a PC
  • Memory stores up to 99 data records
  • Retrieve Max/Min readings with data and time
    plus Average function
  • Real time clock
  • Triple display with backlighting
  • Unique sensor cap design twists to closed
    position for protection during storage
  • Switchable °F/°C temperature units with 0.1° resolution
  • Data Hold freezes current reading on display
  • Auto power off to save battery life
  • RH355 kit includes RH350, 33% and 75%
    calibration bottles, PC cable, and carrying case

Click here for a larger image - Extech RH350 SuperHeat PsychrometerClick for larger image Click here for a larger image - Extech RH355Click for larger image
Extech RH350
Extech RH355

Product Information

Datasheet 155 KB
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Ordering Information
Model Description Buy Online Price
RH350 Extech RH350 SuperHeat Psychrometer Buy Now Sale $95.99
(Reg. $149.99)
RH350-NIST Extech RH350-NIST SuperHeat Psychrometer with NIST Buy Now $274.99
RH355  Extech RH355, PSYCHROMETER, DATALOGGER KIT   Discontinued 
RH355NIST  Extech RH355-NIST, PSYCHROMETER KIT W/NIST   Discontinued 
Included Accessories
  RH350 Includes:
  • (2) Type K bead wire temperature probes
  • (4) AAA batteries

RH355 kit includes:

  • (1) RH350
  • (1) PC cable
  • (1) Carrying case
  • (1) Set of 33% and 75% Calibration bottles

Replacement Accessories

444703 Extech 444703 Humidity Solution 33% RH Calibration Buy Now
RH350-CAL Extech RH350-CAL Humidity Solution Kit for RH350 Buy Now Sale $48.71
(Reg. $55.99)

*NOTE: Items ordered with optional NIST calibration will require
approximately 10 days to complete the certification.