ആമുഖം
The Extech MO55 is a versatile combination pin/pinless moisture meter designed for quick and accurate moisture measurements in various materials. It is an essential tool for building restoration projects, moisture detection in floors, tiles, and behind walls, and analyzing the effects of water leakage. This manual provides detailed instructions for the proper use, maintenance, and troubleshooting of your MO55 moisture meter.

Figure 1: Extech MO55 Combination Pin/Pinless Moisture Meter. This image shows the front view of the green and orange meter with its digital display showing "99.9%".
പ്രധാന സവിശേഷതകൾ
- Dual Measurement Modes: Offers both pin (invasive) and pinless (non-invasive) measurement capabilities for diverse applications.
- മെറ്റീരിയൽ വൈവിധ്യം: Measures moisture levels in wood, wall board, sheet rock, cardboard, concrete, plaster, and mortar.
- Moisture Icons: Provides visual indicators for low, medium, and high moisture content levels on the display.
- കേൾക്കാവുന്ന അലേർട്ട്: Features an audible tone that increases in frequency as moisture levels rise, aiding in quick detection.
- Pinless Depth: Non-invasive mode can read moisture up to 1 inch (25mm) below the surface.
- ഡാറ്റ ഹോൾഡ്: Allows freezing of the current reading on the display for convenient viewing.
- കോംപാക്റ്റ് ഡിസൈൻ: Lightweight and easy to handle for on-site measurements.

Figure 2: Close-up of the Extech MO55 display showing moisture level icons. The display indicates a 50.0% reading with three water droplet icons, signifying a high moisture level.

Figure 3: Close-up of the Extech MO55 display highlighting the battery life indicator and the button to toggle material type. The display shows a 50.0% reading and a full battery icon.

Figure 4: Close-up of the Extech MO55 display showing the audible alert icon and the button to toggle display lock and audible alert. The display shows a 50.0% reading and an active audible alert icon.
സജ്ജമാക്കുക
ബാറ്ററി ഇൻസ്റ്റാളേഷൻ
- Locate the battery compartment on the back of the MO55 meter.
- ബാറ്ററി കമ്പാർട്ട്മെൻ്റ് കവർ തുറക്കുക.
- Insert one 9V battery, ensuring correct polarity (+/-).
- ബാറ്ററി കമ്പാർട്ട്മെൻ്റ് കവർ സുരക്ഷിതമായി അടയ്ക്കുക.
പ്രാരംഭ പവർ ഓൺ
പവർ ബട്ടൺ അമർത്തുക (⑂) to turn on the device. The display will illuminate, and the meter will be ready for use.
പ്രവർത്തന നിർദ്ദേശങ്ങൾ
Selecting Measurement Mode (Pin vs. Pinless)
The MO55 offers two measurement modes:
- Pin Mode: For direct contact measurements using the integrated pins. Ideal for wood and building materials where penetration is acceptable.
- Pinless Mode: For non-invasive measurements, suitable for detecting moisture behind surfaces like tiles or walls without causing damage.
To switch between modes, refer to the mode selection button on your device. The display will indicate the active mode.
Taking Pin Measurements
- പിന്നുകളിൽ നിന്ന് സംരക്ഷണ തൊപ്പി നീക്കം ചെയ്യുക.
- Gently push the pins into the material you wish to measure. Ensure both pins make firm contact.
- ഈർപ്പത്തിന്റെ ശതമാനം വായിക്കുകtagഇ സ്ക്രീനിൽ പ്രദർശിപ്പിച്ചിരിക്കുന്നു.
- The audible alert will beep faster as moisture levels increase.
- Press the Data Hold button to freeze the reading if needed.

Figure 5: A hand holding the Extech MO55, with its pins inserted into a wooden stud to measure moisture content. The display shows a reading of 17.4%.

Figure 6: A hand holding the Extech MO55, with its pins inserted into an OSB (Oriented Strand Board) panel, likely checking for moisture. The display shows a reading of 28.5%.
Taking Pinless Measurements
- Ensure the meter is in pinless mode.
- Place the back of the meter flat against the surface of the material.
- Move the meter slowly across the surface to scan for moisture.
- Observe the moisture content percentage on the display. The meter can read up to 1 inch (25mm) deep.
- The audible alert will indicate increasing moisture levels.

Figure 7: A hand holding the Extech MO55, using its pinless sensor against a wall surface to detect hidden moisture. The display shows a reading of 35.7%.
Interpreting Moisture Readings
The MO55 provides visual moisture icons (water droplets) on the display to indicate low, medium, and high moisture levels. Consult the material-specific moisture content chart (often found on the back of the device or in the full user manual) for accurate interpretation of readings for different materials.
മെയിൻ്റനൻസ്
വൃത്തിയാക്കൽ
Wipe the meter with a dry, soft cloth. Do not use abrasive cleaners or solvents. Ensure the pins are clean and free of debris after each use.
ബാറ്ററി മാറ്റിസ്ഥാപിക്കൽ
When the battery indicator shows low power, replace the 9V battery as described in the "Setup" section. Remove the battery if the meter will not be used for an extended period to prevent leakage.
സംഭരണം
Store the MO55 in a cool, dry place, away from direct sunlight and extreme temperatures. Always replace the protective cap over the pins when not in use to prevent damage and injury.

Figure 8: The Extech MO55 moisture meter shown with its protective cap removed and placed beside it, revealing the two measurement pins.
ട്രബിൾഷൂട്ടിംഗ്
| പ്രശ്നം | സാധ്യമായ കാരണം | പരിഹാരം |
|---|---|---|
| മീറ്റർ പവർ ഓൺ ആകുന്നില്ല. | ഡെഡ് അല്ലെങ്കിൽ തെറ്റായി ഇൻസ്റ്റാൾ ചെയ്ത ബാറ്ററി. | ശരിയായ പോളാരിറ്റി ഉറപ്പാക്കിക്കൊണ്ട് 9V ബാറ്ററി മാറ്റിസ്ഥാപിക്കുക. |
| കൃത്യമല്ലാത്ത വായനകൾ. | Dirty pins (pin mode), improper contact, or measuring outside specified range. | Clean pins. Ensure firm contact with material. Verify material type is within meter's range. |
| Audible alert not working. | Audible alert feature is turned off. | Press the button to toggle the audible alert on (refer to Figure 4). |
| Meter turns on accidentally in pocket/bag. | Power button is too sensitive. | Store the meter in a protective case or position it to prevent accidental button presses. |
സ്പെസിഫിക്കേഷനുകൾ
| ഫീച്ചർ | വിശദാംശങ്ങൾ |
|---|---|
| മോഡൽ നമ്പർ | MO55 |
| ഉൽപ്പന്ന അളവുകൾ | 2.6"W x 6.7"H (2.6 x 1.2 x 6.7 inches) |
| ഇനത്തിൻ്റെ ഭാരം | 4.32 ഔൺസ് |
| പവർ ഉറവിടം | 1 x 9V ബാറ്ററി (ഉൾപ്പെടുന്നു) |
| Pin Wood Moisture Range | 5 മുതൽ 50% വരെ |
| Pin Building Material Range | 1.5 മുതൽ 33% വരെ |
| Pinless Wood Moisture Range | 0 മുതൽ 99% വരെ |
| Pinless Building Material Range | 0 മുതൽ 99% വരെ |
| Moisture Icons | അതെ |
| ഡാറ്റ ഹോൾഡ് | അതെ |
| കേൾക്കാവുന്ന അലേർട്ട് | അതെ |
| നിറം | പച്ച |
| നിർമ്മാതാവ് | എക്സ്ടെക് |
| മാതൃരാജ്യം | ചൈന |

Figure 9: A comparison table showing specifications for various Extech moisture meter models, including MO50, MO53, and MO55, detailing their measurement ranges, features like moisture icons, data hold, and audible alerts.
വാറൻ്റിയും പിന്തുണയും
For warranty information and technical support, please refer to the official Extech website or contact their customer service. A comprehensive user manual in PDF format is also available for download:





