Bowers XT Série Notice D'utilisation page 2

NOMENCL TURE & SETTING INSTRUCTIONS (METRIC)
HOW TO RE D...
Metric micrometers above the 20mm range are graduated in 0.005mm
divisions. Metric micro micrometers below the 20mm range are graduated
in 0.010mm divisions. The sleeve has a datum line, and the thimble is
graduated as illustrated below. The sleeve is graduated in 0.5mm
divisions and one complete revolution of the thimble is equal to 0.5mm.
To read the instrument, read the size on the sleeve to obtain the nearest
half millimeter, and to obtain hundredths and microns read the number
on the thimble which lines up with the datum line.
Metric micro micrometers have an included vernier scale (to accurately
read the micron measurement) on the sleeve, graduated in either
0.001mm or 0.002mm divisions. To read the vernier scale, read the
vernier graduation that lines up with the thimble graduation.
Examples are illustrated below.
In the illustration above In the illustration above
the micro micrometer reading the micrometer reading
would be 16.066mm would be 20.015mm