Variations in temperature will cause a multitude of effects. The object will change in size by thermal expansion, which will be detected as a strain gauges. Resistance of the gauge will change, and resistance of the connecting wires will change.  Let's us see the detection of strain gauge.
  
 From the measured electrical resistance of the strain gauge, the amount of applied stress may be inferred. A typical strain gauge arranges a long, thin conductive strip in a zig-zag pattern of parallel lines such that a small amount of stress in the direction of the orientation of the parallel lines results in a multiplicatively larger strain over the effective length of the conductor—and hence a multiplicatively larger change in resistance—than would be observed with a single straight-line conductive wire.