H68.0.03.6C-02 Operating Manual GMI 15 plus page 7 of 12
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6.3 Hold the device
The water content of the hand has an impact on the measuring value, if the device is held
inappropriately.
The best results will be obtained if you lay the device down or hold it the way as shown in picture 3.
Picture 1: Held in a wrong way!
Picture 2: laid down – right!
Picture 3: Held in the right way!
6.4 Characteristics and materials
Reference characteristics
Wood, density = 550 kg/m
3
Concrete (density ≈ ca. 2.2 to/m
3
)
In the appendix there is a table with the assignment of which wood species correspond to the
specified density. Other types of wood can also be measured, but a higher deviation than specified
is to be expected.
The materials are selected with these keys:
material selection upwards: press
Material selection downwards: press at the same time
The use of inappropriate characteristics can cause faulty measurements!
The device is an indicator, not a precision measuring device. More accurate
measuring can be obtained with the GMK 100 or GMK 210 devices with more
selectable characteristic curves.
6.5 Zeroing function
It is recommended to run regularly the zeroing function
for best measuring results:
Hold the device in the air as shown in the left picture
and press key “hold” for 2 seconds.
You can easily see whether the zero point is ok with
the “rEF” characteristics. If the device shows at air a
value <0.5 or >0.5 or “Er.4” with “rEF” characteristics
you have to run the zeroing function.
Please pay attention not to influence the
zeroing function with your hands. The
best way to ensure this is shown left.
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