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the norm, fine carpenters have learned how to work with
wood with 11% moisture content. But in bone-dry
Nevada, Utah, and Arizona, where 30% humidity is
common, the same piece of wood would have to have
less than 6% moisture to be considered ready for
finishing.
2. To locate the source of a leak behind wood, plaster,
drywall or a ceiling, make measurements at different
locations. The leak is where the meter displays the
highest reading.
3. Never use force to drive the test pins into a hard surface.
4. When measuring the moisture level of soil, surface
readings will be lower than readings with the test pins
deep in the soil.
• When the icon appears at the upper left of the LCD,
it’s time to replace the “9V” battery that powers the
instrument (although measurements will remain valid for
several hours after the icon first appears). To replace the
battery, turn the meter over and open the battery
compartment (Fig. 1, Callout J) by using your thumb to slide
the compartment cover down and away from the meter.
Plug a fresh “9V” battery into the wired socket inside the
compartment. The terminals of the battery and the socket
mate in only one way, with the smaller male terminal
plugging into the larger female terminal. Close the battery
compartment by replacing its cover and snapping it shut.
• Do not operate the MMD4E in the presence of flammable or
explosive gases.
• Be careful not to stab yourself with the extremely sharp test
pins.
8
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