What is the magnitude of a technical "strain"

Usual orders of magnitude of strain in technical applications

A steel rod with a length of one meter expands by 12 micrometers per degree Celsius temperature change.
An aluminum rod expands by 23 micrometers per meter per degree Celsius, almost twice as much compared to steel.
A force sensor is loaded up to strain of 1000 micrometers per meter (1 per thousand).
If an aluminum sensor is used, then 44 degrees Celsius will cause as much strain as a 100% load of a force sensor (1000um/m).
A force sensor made of aluminum undergoes an elongation of 10 μm / m at a load of 1%, or at a temperature change of 0.44 ° C.