Extech MO55W Operating Manual

USER MANUAL

Model MO55W
Wireless Datalogging Dual Moisture Meter

Pin and Pinless Moisture Measurements

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Introduction

Thank you for choosing the MO55W Wireless Datalogging Dual Moisture Meter. Use the MO55W
to take pin-based and pinless moisture measurements on wood and other building materials.

The MO55W is compact, easy to operate, and indicates moisture levels in a variety of ways:
digitally, audibly, and with ‘moisture droplet’ icon displays (1 drop for low levels, 2 for moderate
levels, and 3 drops for high moisture levels).

Pin-based measurements are the most accurate; however, they are invasive. Pinless
measurements are also accurate, but for best results use them for dry/wet comparison testing.

The MO55W is perfect for building restoration projects and other applications where it is critical
to detect moisture in and around flooring, tiles, and carpeting.
Transmit real-time readings, data-logged readings, and alarm data to your iOS® or Android™
devices thanks to the supplied Bluetooth® Wireless Datalogging Module (DAT12) and the ExView®
W-Series application.
The free ‘app’ is available from the Apple App store and Google Play™ store.

We ship this meter fully tested and calibrated and, with proper use, it will provide years of
reliable service. Please visit our website (www.extech.com) to check for the latest version of the
User Manual and for Customer Support.

Features

• Detects moisture in wood and other building materials (wall board, sheet rock, cardboard,

plaster, concrete, and mortar)

• Pinless measurements (internal moisture sensor) provide reference readings for dry/wet

comparison testing

• Pin-based moisture measurements for highest accuracy

• Easy ZERO/OFFSET calibration for pinless mode

• Beeper rate increases as moisture level increases (8 tone variations)

• ‘Moisture droplet’ icons indicate low, medium and high levels of moisture

• Easy-to-use, battery operated, and compact design

• ‘Display Hold’ freezes reading on display

• Supplied Bluetooth® Wireless Datalogging Module (DAT12) transmits real-time moisture

readings, logged readings, and alarm data using the free iOS® or Android™ ExView® W-Series

application. The DAT12 stores over 15k readings.

• Auto Power OFF (APO) after 3 minutes to conserve battery power. There is no APO when

connected to the wireless application.

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Description

Meter Description

1. Protective cap and pin-mode test circuit

2. Measurement pins

3. LCD Display

4. Power ON/OFF button (long press)

5. Mode button: Short press to select pin,

pinless, wood, or building materials.
Long press to enable wireless
transmission (radio icon appears)

6. Display Hold (short press)/Beeper

button (long press)

7. Internal pinless moisture sensor

8. Battery/wireless module compartment

Display Description

1. Moisture droplet icons (1 drop for low moisture, 2 for moderate, and 3 for high)

2. Wood mode

3. Building material mode

4. Beeper active icon

5. Moisture reading digits

6. Unit of measure

7. Wireless transmission icon

8. Display Hold mode

9. Battery status icon

Button Description

Button

Button name

Description

Power ON-OFF button

Long press to switch the meter ON or OFF

Mode/Wireless button

Short press to select wood, building materials,
pin or pinless (flashing icon) modes
Long press for wireless transmission

Display Hold / Beeper button

Short press locks reading on the display
Long press disables/enables the beeper