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It is recommended to repeat the measurement in a few points situated next to each other as humidity
has a tendency of uneven distribution. If the measurements vary, only the highest outcomes should
be used.
• To switch off the meter press ON/HOLD button for around 2 seconds.
3. Preparation of the surface before measuring
All concrete heating/drying equipment should be switched off at least 96 hours before taking the
final measurements. Otherwise the outcome may not reflect the actual humidity level or
displacement of humidity in tested material. Before the measurement may be taken, the analyzed
surface should be cleaned- there should not be any foreign substances like plastic films, dust etc.. In
case of measuring concrete floors all covering materials like: concrete additives, primers, paints,
etc., should be removed in order to reveal pure concrete that is going to be measured.
All cleaning and cover-removing works should be finished at least 48 hours before taking the
measurement. VI-D4 meter should not be used to measure concrete on which there is water in a
liquid state. Measurements should be avoided in areas exposed to direct sunlight or other sources of
heat.
4. Available scales
1. Concrete 0-6% H2O
Concrete scale may be used only for concrete surfaces. It shows the relation between weight of pure
water contained in the tested material with its dry weight. The scale range varies between 0 and 6%
as 6% is about maximal physically possible content of water in the concrete. The obtained results
should not be confused with moisture emission or any other humiditymeasurement methods.
2. Cement Screed (0-6%H2O)
This scale is used to measure the moisture content of cement screed. The content of water is
expressed as a percentage of weight.
3. Cement Screed (0-4% CM)
This scale is used to measure the moisture content of cement screed. The displayed value is an
approximate value that can be also determined using the Carbide Method (CM).
4. Anhydrite Screed (0-3.5% H2O)
This scale is meant for moisture measurements in anhydrite floors. The displayed value is an
approximation of a value that normally would be indicated using a CM-measurement device.
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