Every day. When changing between standard head and 2/4mm adaptor, re-calibration is essential

Calibrate with standard measuring head.

Using a standard adaptor, the measuring head should be positioned flat against the surface to be measured.

To increase repeatability of measurements on curved surfaces or small parts, essential for complex curves

Yes, see table. 60 and 85 give greater resolution of measurement at these gloss levels (small visible differences in finish = a large difference in gloss value)
Whilst 20 has a smaller measurement resolution, visiblee differences in gloss can be quantified with the Flex 20.

The measuring head should only be connected to the
instrument for measuring larger flat surfaces. It is recommended to connect the instrument to the measuring head using cable for ease and stability of measurement

This should be used for the measurement of all cylindrical objects
Surfaces with curvature greater than…