Extech Instruments MO53 User Manual page 2

Operation
Powering the Meter and Self-Calibration
Long press the power button to switch the meter on/off. The meter beeps and displays ON as it
powers up. If the meter does not switch on, please check the battery. The meter emits audible
tones and performs a self-calibration upon start-up. Keep the measurement sensor at least 8 to 10
cm (3 to 4") from hands and objects during calibration. The calibration reading must not exceed 0.5.
If so, re-calibrate ensuring that hands or other objects are clear of the sensor. Note: Calibrate the
meter whenever moving from one measurement area to another.
Auto Power OFF
The meter will automatically power OFF if the reading stays 0% for 3 minutes. If the meter detects
readings, other than 0%, it will not automatically power OFF.
Display Hold Lock
Short press the Display Lock button
the display when Display Lock is active. Press
Beeper ON/OFF
The beeper defaults to ON. To switch the beeper OFF, long press the Display Lock/Audible Beeper
button . When the beeper is active, the audio display icon
Pinless Moisture Measurements
1. Short press the Material Select button (
modes. The displayed icons indicate the selected mode.
2. Position the sensor (located on back of meter, directly behind LCD) firmly on a flat surface so
that it directly touches the measurement area. The measurement surface area should be larger
than the sensor surface area.
3. Observe the displayed relative readings, view the displayed moisture droplet icon(s)
drops indicate higher moisture levels), and listen for the audible beeping (faster beeping
indicates higher moisture; there are eight intensity levels). As discussed in the Measurement
Considerations section, the displayed reading is an average of the moisture measured over the
entire sensor surface area to the maximum penetration depth. The section Relative Moisture
Reading Ranges, below, provides measurement and droplet icon ranges.
Relative Moisture Reading Ranges
TOTAL RANGE >
LOW
MEDIUM
HIGH
to freeze the displayed reading. The icon is visible on
again to return to the normal operating mode.
will be visible.
) to toggle the Wood and Building Material
WOOD (%) BUILDING MATERIAL (%)
0.1 ~ 99.9 0.1 ~ 56.5
0.1 ~ 29.9 0.1 ~ 13.9
30.0 ~ 69.9 14.0 ~ 41.9
70.0 ~ 99.9 42.0 ~ 56.5
Maintenance
Battery Replacement
When the battery status icon
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.
Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate
collection sites, the retail store where the batteries were purchased, or wherever
batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is obligated to take
end-of-life devices to a designated collection point for the disposal of electrical and electronic
equipment.
Care and Cleaning

Store the meter in an environmentally stable, dust-free environment, out of direct sunlight.

Remove the battery from the instrument if the meter is to be stored for long periods or if
the battery power symbol appears empty (or flashing) on the display.

To clean the meter case, wipe with a damp cloth, do not use solvents or abrasives.
Specifications
Display
Measurement Type
Measurement Indication Digital relative reading in %, moisture drop icons (1, 2, or 3 droplets),
(more
Measurement Ranges:
Wood: Low: 0.1% to 29.9%; Medium: 30.0% to 69.9%; High: 70.0 to 99.9%
Building Materials: Low: 0.1% to 13.9%; Medium: 14.0% to 41.9%; High: 42.0 to 56.5%
Measurement depth
Resolution
Accuracy
Auto Power OFF
Power Supply
Low Battery indication
Low Battery APO
Operating Conditions
Storage Conditions
Dimensions
Weight
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2
appears empty or flashing, replace the battery.
LCD with multi-function indicators
Pinless, non-destructive
audible tone (8 intensity levels) indicating low to high moisture readings
Sensor detects to a depth of 20mm (0.8")
0.1%
Relative readings only
After approx. three (3) minutes with a 0% display reading
One (1) 9V battery, battery consumption: < 40mA
< 7.5VDC, approximately
< 5.5VDC; APO will occur in 20 seconds, approximately
5 ~ 45 o C (41 ~ 113 o F); 80%RH max.
0 ~ 50 o C (32 ~ 122 o F); 85%RH max.
170 x 65 x 30mm (6.7 x 2.6 x 1.2")
120g (4.2 oz.) without battery
Copyright © 2017 FLIR Systems, Inc.
www.extech.com
MO53-en-GB_V1.0 7/17