The wire-type strain gauge consists of wire 1 of a strain-sensitive
m aterial, several dozens of microns in diameter, glued to
a paper backing. The strain gauge is glued to the surface of the
item being tested. Soldered to the ends of wire 1 are thicker
copper wire leads 2 by means of which the strain gauge is connected
to the measuring circuit. This strain gauge enables surface
deformation of the item to be measured, because the change
in the resistance of wire 1 is proportional to the surface strain.
$4353$SmE,M$