Tramex MRH III 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-i ® 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.


Moisture behind an Exterior Insulation & Finishing System (EIFS) can result in extensive damage of the building structure, while being difficult to locate due to lack of visible evidence of moisture and decay on the external portion of inside or outside walls. Wet insulation reduces the effectiveness of the thermal barrier, and excess moisture between walls causes mould and rot. Failure to remediate moisture problems within walls can ultimately result in failure of the cladding system and even the wall itself.


MRH 3 Moisture & RH Meter used with Tramex' Hygro-I® RH probes allows the user to take in-situ or hood-type RH measurements in concrete floors, in accordance with ASTM F2170 Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes.



Features of the MRHIII Moisture and Humidity Meter

  • Digital, non-destructive moisture meter.
  • Optional plug-in wood probe.
  • Optional plug-in Tramex Hygro-i ® relative humidity probe for relative humidity, temperature, dew point and mixing ratio readings.
  • Deep signal penetration to over 1" into the materials being tested without the need to damage the surface. Signal penetration depends on material being tested and meter setting.
  • Specific gravity adjustment for most wood species. 
  • External Rubber electrodes make direct contact with the material being tested for best sensitivity and repeatability.  
  • Wide range of readings for wood of 5% to 30% and 0 to 100 comparative for all other materials.
  • Backlit, large, clear, easy to read LCD display.  
  • “Hold” function enables user to "freeze" the reading. Useful for taking readings when the meter face is not visible.
  • Switchable "On" or "Off" audio warning tone.    
  • Automatic power cutoff switches "Off" when not in use.
  • Automatic default to last user setting when switched back on.
  • Battery operated (included).
  • Tramex 1-year warranty against defects in materials & workmanship


Industries water damage restoration, indoor air quality, pest control, home inspection, building surveying, flooring, residential roofing
Material drywall, wood, plaster, brick, ceramic, porcelain tiles, resilient flooring, laminates, asphalt composition shingles, and most building materials
Body ABS
Power 9 V PP3 battery
Depth of penetration up to 1 ¼" (20 mm) wood & drywall; + 1 inch other materials *
Wood non-invasive moisture 5 to 55% (a S.G. of 0.3)
Wood invasive mode 7 to 40% using optional pin-type wood probe
Reference Scale 0 to 100 for non-wood building materials
Relative Humidity 0 - 99% RH using optional Hygro-I® RH probes
Dimensions 8.47 oz (240 g)  6 x 3.5 x 1.5" (150 x 85 x 38mm)


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