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MiniTest 725, MiniTest 735, MiniTest 745
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5.4.2 High-precision stand
For taking readings on small objects and small geometries, it is recommended to use the external
sensor in connection with the high-precision stand.
Using the standard sensor
Using the miniature sensor SIDSP
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F05-M 45°
5.4.3 Duplex coating systems
To add additional corrosion protection to a product or for design reasons, it is common practice to
apply a zinc coating to a steel product before painting. For measurement of zinced steel with
additional surface finish, please use the dual sensors FN1.5 or FN5 sensors. With these sensors,
you can determine the thickness of the zinc coating as follows:
1. Set the gauge to ferrous substrates and take reading. The total thickness of zinc plus
surface finish will measured (thickness # 1)
2. Set the gauge to non-ferrous substrates. The zinc coating will be considered as non-ferrous
substrate and the thickness of paint will be measured (thickness # 2)
3. Now you can evaluate the thickness of zinc coating by calculating the difference between
the thickness #1 and thickness #2.
Please note that for measurement of duplex coating systems, a minimum zinc thickness of 50µm is
prerequisite. For checking whether your zinc coating thickness is sufficient, please take zero value
in the non-ferrous setting. Starting from a 50µm zinc thickness, the zero value is sufficiently good
so that you can measure your duplex coating as described above.
5.5 Errors during measurement
After the sensor has been calibrated, you can proceed on taking readings in the measuring mode.
Readings will be correct as long as the sensor specifications will be observed. Please refer also to
section 6.1 Calibration „General remarks“and Section 13 „Technical specifications“.