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Home  >>  Products  >>  Moisture/Air/Temperature  >>  Tramex MRH III

Tramex MRH III Moisture and Humidity Meter

Hygro-i2® probe for in situ or hood testing of concrete per ASTM F2170

The Moisture and Relative Humidity MRH III is a hand-held digital moisture meter calibrated for most building materials. It also incorporates optional plug-in heavy-duty pin-type wood probes and Hygro-i2® probes for measurement of relative humidity and ambient conditions and allowing for testing of concrete per ASTM F2170 or BS 8201 (with optional sleeves or hood). Suitable for many industries including Flooring, Water Damage Restoration, Indoor Air Quality, Home Inspection and Pest Control.

3 Modes of Operation:
Non-destructive testing of moisture content in wood, tracing moisture in wood based products and many other building materials such as bricks, plaster, ceramic tiles and laminates.

Pin-probe plug-in attachment (optional) for moisture content in wood and an indication of moisture conditions in wood based products.

Hygro-i2® probe attachment (optional) for relative humidity and temperature measurement

Tramex MRH




  • Deep signal, non-destructive penetration up to 1-1/4" in wood and drywall in non-destructive mode.
  • Detects moisture through paint, wall coverings, drywall, ceramic tiles, floor coverings, wood, roof coverings and most building materials.
  • Hold function "freezes" meter reading when inspecting areas where the meter face is not visible.
  • Audio signal sounds when meter indicates high readings.
  • Large clear backlit digital display giving meaningful readings.
  • Accuracy in very low moisture content readings and up to 55% moisture content readings in wood in non-invasive mode.
  • Attachable pin-type wood probe for invasive testing (optional).
  • Adjustment of specific gravity for wood species correction.
  • Attaches to a reusable relative humidity Hygro-i2® probe for in situ or hood testing of concrete per ASTM F2170. (optional)
  • Attachable Hygro-i2® Relative Humidity probe for relative humidity, temperature, dew point and grains per pound readings all shown on one clear display (optional).

MRH Probes


Technical Data

Technical Data
Size: 6" x 3.5" x 1.5" (150mm x 85mm x 38mm)
Weight: 8.47oz (240g)
Construction: ABS Body
Power: 9 volt PP3 Battery (included)
Display: Digital/Backlit
Depth of Penetration: Up to 1-1/4" (30mm) in wood and drywall
Measuring Range
Reference Scale for Building Materials: 0 to 100
Relative Humidity with Optional Hygro-i2® probe): 0 to 99%
Wood Non-invasive Mode: 5 to 55% MC (at SG of 0.3)
Wood Invasive Mode with Optional Wood Pin Probes: 7 to 40% MC


How It Works


Product Design - The MRH III operates on the principal of non-destructive impedance measurement. Co-planar electrodes are fitted on the base of the instrument from which low frequency signals are transmitted into the material under test, measuring the change in impedance caused by the presence of moisture. This reading is translated by the instrument into a moisture content reading.

Operating Procedure -When the Tramex Hygro-i2® relative humidity probe is plugged into the MRH III, it automatically changes to Hygrometer Mode. The Tramex Hygro-i2® provides the ideal solution for measurements of ambient relative humidity, temperature and dew point conditions within the building structure and in structural materials such as concrete flooring, walls etc.

Tramex MRH






Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices
The Model MRH II is still available at half-price.
MO-944601 MRH III (Meter only) $575.00
MO-950927 Relative Humidity Probe (Converts New MRH III to digital hygrometer) 201.00
MO-959510 Hand Held Electrode (w/cable and 5/8” pins) 126.00
MO-959511 Hand Held Electrode (w/cable and 3” insulated pins) 140.00
MO-944603 Hand Held Electrode (w/cable and 7” insulated pins) 165.00
MO-944605 Hammer Electrodes (w/cable and 1.5” insulated pins) 228.00
MO-950933 Hygro-i Hole Liners & Caps (pkg/50) 96.00
MO-950939 Insultaed RH Hood for Surface RN Testing 100.00


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