User manual

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MO53-en-GB_V1.0 7/17

USER MANUAL

Pinless Moisture Meter

Model MO53

Introduction

Thank you for selecting the Extech MO53 Pinless Moisture Meter. The MO53 sensor performs non-

invasive, relative moisture measurements on wood and building materials such as wallboard, sheet

rock, cardboard, plaster, concrete, and mortar. The MO53 also offers auto power off (APO), display

lock (hold), and self-calibration features.

The MO53 is ideal for building restoration projects and applications where moisture detection on

floors and under carpets is critical. The MO53 is also a handy tool for analyzing the effects of water

leakage behind walls and in ceilings.

This meter ships fully tested and calibrated and, with proper use, will provide years of reliable

service. Please visit our website (www.extech.com) to check for the latest version of this User

Manual, Product Updates, and Customer Support.

Measurement Considerations

To measure moisture, the MO53 sensor emits and senses low-power electro-magnetic signals. The

displayed reading in percent is an average of the moisture content measured over the entire sensor’s

surface area (40x40mm [1.6x1.6”]) and the maximum depth of penetration (20mm [0.8”]). Moisture

that is closer to the surface has a greater effect on the displayed average than the moisture nearer to

the maximum depth of penetration.

Placing the sensor on a surface whose thickness is less than the maximum depth of penetration may

result in unreliable moisture readings; in these cases, you can stack material on top of the measured

surface to increase the thickness.

The MO53 also produces audible tones and ‘moisture droplet’ display icons to indicate moisture

level. The audible tone rate and number of droplets increase as the moisture level increases.

Meter Description

1. LCD Display

2. Power button

3. Display Lock/Beeper button

4. Material Select button

5. Sensor (back of meter, directly behind LCD)

Note: Battery compartment on rear of meter

Display Description

1. Moisture Drop icons (one for low moisture, two for medium, and three for high)

2. Wood mode

3. Building Material mode

4. Beeper active icon

5. Moisture reading

6. Digital reading in % (relative)

7. Display Lock mode

8. Battery status

Button Description

Symbol

Name

Description

Power ON-OFF button

Long press to switch the meter ON or OFF

Material Select button

Short press to select wood or building materials

Display Lock / Beeper control

Short press locks reading on the display

Long press toggles the Beeper ON/OFF

Summary of content (2 pages)

PAGE 1
Meter Description USER MANUAL 1. 2. 3. 4. 5. Pinless Moisture Meter Model MO53 LCD Display Power button Display Lock/Beeper button Material Select button Sensor (back of meter, directly behind LCD) Note: Battery compartment on rear of meter 1 5 2 4 3 Introduction Thank you for selecting the Extech MO53 Pinless Moisture Meter. The MO53 sensor performs noninvasive, relative moisture measurements on wood and building materials such as wallboard, sheet rock, cardboard, plaster, concrete, and mortar.
PAGE 2
Operation Maintenance Battery Replacement Powering the Meter and Self-Calibration When the battery status icon appears empty or flashing, replace the battery. 1. Remove the rear battery cover by pushing the compartment latch (bottom, back of meter). 2. Replace the 9V battery observing correct polarity. 3. Replace the battery cover securely. 4. Dispose of battery responsibly and within applicable legal regulations. Long press the power button to switch the meter on/off.