BS 1881-206.
It is used for finding out the linear deformation caused on two
reference points fixed on a loading member.
Specification :
This portable gauge is designed for a gauge length
of 20 cm. of the reference pins. The deformation is indicated by a
0.002 x 5mm dial gauge attached to the instrument. Complete with
two standard bars for 20 cm gauge length supplied in a wooden
case.
Accessories :
Reference pins in packet of 100 nos. at an extra cost.