General Tools and Instruments MMD950 - Manual (Page 8)

To change the default settings for the beeper, backlight or auto power function,
follow the Advanced Setup Instructions beginning on p. 9. At a minimum,
General recommends changing the default for the auto power off function to
“enabled”. If you leave the auto power off function disabled, you run the risk of
discharging the meter’s battery if you forget to power the meter off when you
are finished using it.
MEASURING MOISTURE LEVELS
Surface moisture levels should be measured by the test pins of the remote
probe if the surface can tolerate pinholes. If it cannot, use the meter’s spherical
sensor. Internal moisture levels can be gauged by the spherical sensor for
comparison purposes.
To use the remote probe, remove the small rubber yellow plug from the jack
on the right side of the meter (callout K of the figure). Then insert the white plug
at the end of the cable into the jack.
To make a surface moisture level measurement, press the Mode button as
many times as necessary until %WME appears on the top line of the LCD. Then
press the test pins against the target material. The material’s surface moisture
level will be displayed as a percentage on both the LCD and the LED bar graph.
The bar graph uses LEDs of three different colors (green, yellow and red) to
indicate different moisture level ranges (low, medium and high, respectively).
Readings below 17% are considered low, readings between 17% and 30%
medium, and readings above 30% high. If the beeper is enabled with the
factory-default setting, it will beep faster the higher the moisture level rises
above 17%.
To gauge the internal or surface moisture level of a material, enter REL
mode by pressing the Mode button as many times as necessary until REL
appears on the top line of the LCD. To establish a baseline for relative readings,
press the spherical sensor against a material known to be completely dry. This
should produce a reading of 0 on both the LCD and LED bar graphs. Then press
the spherical sensor against one or more points on the target surface and
compare the readings.
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