The measuring-probe MLO1018 is inserted into a borehole in a tie bar and then preloaded with a special tool to measure the strain at the sensortip.
The 2 strain gauges in the sensor tip are pressed so hard onto wall of the hole that friction replaces the bonding normally used to fix strain gauges.
The mounting is very fast, and the strain gauge is protected.
The sensor can not be overloaded.
There is no other way to fix strain gauges in deep holes.