RHP-SW 4.5" RH Probe


The Tramex Relative Humidity Probes are the most advanced, resilient and re-usable RH probe on the market today, allowing the user to evaluate moisture conditions within the building structure. The different lengths and thicknesses make them ideal for use by Flood and  Water Damage Restoration as well as Building  Survey professionals. The probes, which house the latest Hygro-i2 technology, measure Relative Humidity, Temperature, Dewpoint temperature and grains per pound humidity ratio. The probes can be used for the evaluation of moisture conditions of wall and cavity structures as well as ambient air conditions  within the building envelope. The speed and accuracy of the Tramex Hygro-i2® probes set them apart from all other RH probes on the market. The confidence in knowing you are testing with the best and fastest RH probe  brings reliability and peace of mind to a whole new level.


  • Fast Acclimation and Temperature response time.
  • Proven robustness, Durable and Reusable.
  • Best in class accuracy and reliable, even at high RH >90%.
  • Measures giving in situ relative humidity and ambient RH, temperature,  dew point temperature & grains per pound.
  • Relative Humidity range:  0% to 100%
  • Temperature Range:  -40°F to 176°F (-40°C to 80°C)
  • Best temperature accuracy of +/-2º over 32ºF to 194ºF (0ºC to 90 ºC)

Product Order Code: RHP-SW (with Din Connection for use with CMEX2 and MRH3)

Product Order Code: RHP-SWB (with Bayonet Connection for use with Feedback Datalogger RHTX and upcoming CMEX5)



Used in conjunction with the Tramex CMEX II or the Tramex MRH III non-destructive moisture meters, the probes provides measurements of relative humidity, temperature, dew point and grains per pound in structural materials such as concrete flooring and walls, as well as the ambient conditions within the building envelope, all shown simultaneously on one clear display. The probes are reusable and calibration checks can be carried out using the calibration check salts.




Range: 0 to 100%RH                  

Accuracy: 0% to 99%RH ±2.0%RH (@ 77ºF (25ºC))

Resolution: 0.1% over the complete range

Drift: <0.25%RH per year



Range: -40ºF to 257ºF (-40ºC to 125ºC)

Accuracy: ±0.1ºF

Range 68ºF to 140ºF (±0.1 °C Range 20°C to 60°C)

Sensor Protection: PTFE Film protects sensor opening from water & dust

Drift: <0.04ºF (0.03ºC) per year NIST traceable. (National Institute of Standards and Technology)

Related Products

Concrete Moisture Encounter Expert


Instant and non-destructive moisture content tests per international standard ASTM F2659 with the CMEX II, a digital version of the CME4 handheld electronic moisture meter, designed for the instant and precise measurement of moisture content in concrete slabs, featuring Carbide Method equivalent scales for concrete and anhydrite screeds and giving comparative readings in other cementitious floor screeds. 

Moisture and Humidity Meter


The Tramex MRH III Moisture and Humidity Meter is a hand-held digital moisture meter calibrated for most building materials. It also attaches to an optional plug-in Tramex Hygro-i2 ® relative humidity probe and heavy-duty pin type electrodes. Suitable for many industries including Water Damage 
Restoration, Flooring, Indoor Air Quality, Home Inspection and Pest Control.

Calibration Salt Check


Calibration Salt Check for Hygro-i probes. Designed to produce a 75% RH environment within the chamber which may be used to ensure the calibration of the Hygro-i2 ® RH probe is optimum.