MO250 Datasheet, PDF (5/6 Pages) Extech Instruments Corporation. – Moisture Meter

External Probe (optional)
An optional external probe is available (part number MO252) that allows the user to reach
into areas that would be difficult to access with the meter’s built-in electrode pins.
1. The input socket for the external probe is located at the top of the meter.
2. The plug and jack are keyed so that the plug can only fit in the jack one way.
3. Turn the plug carefully until it lines up with the jack and then firmly push the plug in
place. Do not apply undue force or try to twist the plug side-to-side.
4. The meter will continue to operate as described in this manual.
Battery Replacement
If the instrument does not switch ON or displays the low battery symbol , replace the
battery as follows:
1. Open the rear battery cover by removing the screw using a Phillips head
screwdriver
2. Replace the 9V battery
3. Put the battery cover back in place. Secure with the Phillips 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
Resolution
Accuracy
Sampling rate
Memory
Measurement principle
Range
Electrode pin length
Electrode pin type
Power supply
Power consumption
LCD digital display and red LED bargraph scale
0.1%
± (5% rdg + 5 digits)
One reading every 0.8 seconds (approx.)
Maximum and Minimum readings can be saved and viewed
Electrical resistance
Wood: 6 to 40%, Building materials: 13 to 100%
0.44” (11mm)
Integrated, replaceable
9V alkaline battery
16mA DC (approx.)
Low Battery Indication
Meter housing
Operating Temperature
Operating Humidity
Dimensions
Weight
Battery symbol displayed on LCD
Impact-proof plastic
32 to 122^oF (0 to 50^oC)
80% Relative Humidity maximum
8.4 x 2.7 x 1.2” (216.5 x 68.5 x 29.7mm)
8.8 oz. (251g)
5
MO250 V2.1 6/06