Extech MO55 Combination Pin/Pinless Moisture Meter

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Quick Moisture Measurements on Wood and Building Materials

Take quick Moisture measurements on wood and building materials with choice of pin or pinless (non-invasive) method. Easy-to-operate with display icons that indicate the levels of moisture content plus audible alert feature. Ideal for building restoration projects and applications where moisture detection on floors, tiles and under carpets is critical. A must-have tool for analyzing the after-effects of water leakage behind walls and in ceilings.

CE logo    1 Year

PDF Logo    MO55 Datasheet
PDF Logo    MO55 User Manual
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SKU: Extech MO55 Categories: , Tags: ,

The compact Extech MO55 takes quick Moisture level reference measurements (in percent %) on wood and building materials. The Extech MO55 can be used in pinless mode (rear sensor) or in pin mode. The MO55 is simple to operate and offers measurement digits, audible tones and ‘moisture drop’ icons to indicate moisture level content.

The MO55 is ideal for building restoration projects and applications where moisture detection on floors and under carpets is critical. The ExtechMO55 is a great tool for analyzing the after‐effects of water leakage behind walls and in ceilings.

Extech MO55 Moisture Meter Features:

  • Displays moisture level in wood and building materials such as wall board, sheet rock, cardboard, plaster, concrete, and mortar
  • Pinless moisture measurement depth to <25mm
  • Audible Alert — Tone rate beeps faster as the moisture level increases
  • Icons display low, medium and high levels of moisture content
  • Easy-to-use, compact-sized design
  • Data Hold freezes reading on display
  • Built-in battery level check and measurement verification test
  • Auto Power Off conserves battery power
  • Complete with pins (2), protective cap, and 9V battery


Display                                                 LCD with multi‐function indicators

Measurement type                               Relative Moisture Content (%)

Measurement principle                        Electrical resistance (pins), Electrical capacitance internal sensor (pinless)

Measurement depth                             Pinless mode: < 25mm

Auto Calibration                                   Pinless mode in open air

Measurement indication                      Digital, “Droplet icons” (1, 2, or 3 droplets) & audible tone with 8 levels of intensity indicating low to high readings

Measurement ranges :

PIN MODE                                          5.0~50.0% (wood), 1.4~33.0% (building materials);

PINLESS MODE                                  0.0~99.9% (for wood and building materials)

Resolution                                           0.1%

Accuracy (Pin mode)                           ± (3% + 5 digits) for ambient conditions 22 °C to 25 °C

Electrode pin length                            0.3” (8mm)

Electrode pin type                               Stainless steel. Integrated, replaceable

Auto Power OFF                                  After approx. two (2) minutes

Power supply                                      One (1) 9V Battery (rear compartment)

Consumption                                       < 40mA

Low Battery indication                         Battery status icon appears empty or flashing

Operating conditions                            5~45°C; 80%RH max.

Storage conditions                               0~50°C; 85%RH max.

Dimensions                                         170 x 65 x 30mm

Weight                                                 120g without battery


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