TB caliper mechanical
unscrew the lock screw your TB caliper mechanical
on the ruler precised at 1 mm
then on the Vernier precised at 0,05mm : find the exact coincidence between the graduation of the ruler andthe Vernier.
add the 2 measurements
Before using the TB caliper, clean the ruler with dry cotton to avoid problems due to dusts.
Keep your instrument clean and dry
The measurement faces must be cleaned with cotton. do not use oil, acetone or other oraganic solution.
Located about 100 km from Paris.