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Whenever a test sample is determined to be "wet" (above 16%
moisture content for wood, or above 20% for a building
material), one or more red LEDs will illuminate and the meter
will produce an audible alarm. The alarm will continue to sound
until the test pins are removed from the sample, or moved to a
drier area.
To silence the excessive-moisture alarm or re-enable it,
press and hold the HOLD button for at least three seconds.
To hold a digital reading, briefly press the HOLD button within
one minute of making the measurement. The LCD will add the
word HOLD to the digital reading, and the bar graph LEDs will
"freeze" in their current state (illuminated or not).
MEASUREMENT TIPS
Ideally, your test sample should be at least 3/8 in. thick. That is
the thickness for which the meter is calibrated. If your sample is
too thin, readings may be inaccurate.
Measurements of wood are skewed by two variables: ambient
humidity and the density of the wood species. The best way to
compensate for the effect of these variables is to develop your
own moisture level curves, based on your experience working
with different species of wood on a day-to-day basis.
CALIBRATING THE METER
Although the MM7 auto-calibrates each time it is powered on,
you can manually check its calibration. Perform a calibration
check whenever the meter cannot produce a reading, or if
multiple measurements of the same sample produce very
different readings.
To manually check calibration, power the meter on and open
and remove the pin cover (Fig. 1, Callout A). Flip the cover over
and insert the test pins into the calibration holes (Fig. 1, Callout
G) through the top of the cover. The LCD should show a value
between 17.3% and 19.3%. If the reading is outside
this range, the MM7 has an accuracy problem. Contact General's
Customer Service to arrange for a replacement.
SPECIFICATIONS
Measurement Ranges
5 to 50% for wood
1.5 to 33% for building materials
Measurement Accuracy
±2% for wood and building material
Measurement Resolution
0.1%
Calibration Check Range
17.3% to 19.3%
Out-of-Range Alarm Levels >16% for wood
>20% for building materials
LCD Size
2 in. (51mm) diagonal, with
three 0.5 in. (13mm) high digits
Bar Graph Composition
3 each green, orange and red LEDs
LED Bands
In wood mode, only green LEDs indicate
that a test area's moisture content is
between 5% and 11.9% (dry). When only
green and orange LEDs are lit, the area
has a moisture content of 12% to 15.9%
(medium moisture content). When green,
orange and red LEDs are lit, the area has
a moisture content between 16% and
50% (wet).
LED Bands (continued)
Auto Power Off Trigger
Low Battery Icon Trigger
Operating Temperature
Storage Temperature
Dimensions
Weight
Power Source
Replacement Test Pins Available
The MM7's stainless steel pins are
replaceable. General's Item #PIN3
contains two pairs of compatible pins,
each 0.3 in. (8mm) long.
WARRANTY INFORMATION
In the U.S, General warrants its instruments and accessories, and
digital tools against defects in material or workmanship for one year
from the date of purchase unless otherwise stated on the packaging,
manual, and/or marketing materials. General also warrants its non-
digital tools products against defects in material or workmanship on
a limited lifetime term. The company will replace or repair the
defective unit, at its option, subject to verification of the defect.
This warranty does not apply to defects resulting from abuse, neglect,
accident, unauthorized repair, alteration, or unreasonable use of the
product.
Any implied warranties arising from the sale of a General product,
including but not limited to implied warranties of merchantability and
fitness for a particular purpose, are limited to the above. General shall
not be liable for loss of use of the product or other incidental or
consequential damages, expenses, or economic loss, or for any claim
of such damage, expenses, or economic loss.
State laws vary. The above limitations or exclusions may not apply
to you.
RETURN FOR WARRANTY CLAIM
Every effort has been made to provide you with a reliable product of
superior quality. To make a warranty claim, please contact our
Customer Service to obtain an RGA (Return Goods Authorization)
number before forwarding the unit via prepaid freight
to the attention of our Service Center at this address:
General Tools & Instruments
75 Seaview Drive
Secaucus, NJ 07094
212-431-6100
Remember to include a copy of your proof of purchase, your return
address, and your phone number and/or e-mail address.
3
In building material mode, only green
LEDs indicate that a test area's moisture
content is between 1.5% and 16.9%
(dry). When only green and orange LEDs
are lit, the area has a moisture content of
17% to 19.9% (medium moisture
content). When green, orange and red
LEDs are lit, the area has a moisture
content between 20% and 33% (wet).
1 minute of inactivity
<7V
32° to 104°F (0° to 40°C)
14° to 122°F (-10° to 50°C)
6.9 x 2.8 x 2.9 in. (174 x 70 x 74mm)
5.3 oz. (150g) without battery
(1) "9V" battery (included)
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