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MO250   V2.1 6/06 

Introduction 

Congratulations on your purchase of the Extech MO250 Moisture Meter. The MO250 
detects moisture in wood and other building materials such as brick, wall board, sheet 
rock, cardboard, paper, plaster, concrete, and mortar. This meter is shipped fully tested 
and calibrated and, with proper use, will provide years of reliable service. 
 

Features 

 

Designed to check the moisture level of wood, concrete, and other non-wood material 

 

Measures from 6% to 40% moisture in wood 

 

Measures 13% to 100% relative moisture for concrete and other non-wood material 

 

Measurements are shown on Red LED bargraph indicator and LCD digital display 

 

Optional external moisture sensor probe (MO252) for remote moisture measurements 

 

Microprocessor provides high accuracy and advanced features such as MAX / MIN 

 

Data Hold feature freezes displayed reading 

 

Heavy duty construction and compact housing enhance portability and durability 

 

Low battery indicator alerts user when battery needs replacing 

 

Description 

Meter Description 

1. 

External probe input 

2. 

Measurement electrode pins 

3. LCD 

display 

4. POWER 

key 

5. HOLD 

key 

6. 

REC MAX/MIN key 

7. MATERIAL 

key 

8. LED 

bargraph 

9. 

External probe plug  

10. External 

probe 

(Optional) 

 

 

 

 

Notes: 

 

External probe is optional (use part number MO252 to order probe) 

 

Battery compartment, tilt stand, and tripod mount are located on the rear of the 
instrument 

 

Electrode pin protective cover not shown 

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com 

Summary of Contents for MW12

Page 1: ...treet Melrose MA 02176 Phone 781 665 1400 Toll Free 1 800 517 8431 Visit us at www TestEquipmentDepot com Back to the Extech MO250 Product Page Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com ...

Page 2: ...al moisture sensor probe MO252 for remote moisture measurements Microprocessor provides high accuracy and advanced features such as MAX MIN Data Hold feature freezes displayed reading Heavy duty construction and compact housing enhance portability and durability Low battery indicator alerts user when battery needs replacing Description Meter Description 1 External probe input 2 Measurement electro...

Page 3: ...ap to expose the electrode pins 2 Press the POWER key to turn the meter ON OFF 3 Press the MATERIAL key to select the material under test A 1 will appear in the right bottom display for concrete and other non wood material A 2 will appear for wood See details below Material 1 13 to 100 relative moisture for concrete and other non wood materials display shows a 1 on the bottom right Material 2 6 to...

Page 4: ... display icon will appear Press the HOLD key again to exit the Data Hold function the HOLD display icon will switch off Max Min Memory feature The meter s Max Min feature allows the user to take multiple readings while storing the highest Max and lowest Min readings 1 Press the REC MAX MIN key to activate the MAX MIN recording mode The display icon REC will appear Now begin taking measurements 2 T...

Page 5: ... screw Maintenance Always keep the instrument dry To clean wipe the meter with a damp cloth Use a mild detergent if necessary but never use abrasives or solvents Prevent dirt from accumulating at the electrode pins Specifications Display LCD digital display and red LED bargraph scale Resolution 0 1 Accuracy 5 rdg 5 digits Sampling rate One reading every 0 8 seconds approx Memory Maximum and Minimu...

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