KFN Type:
The gage element is made of a special alloy which provides less
magnetoresistant effect; also, the shape is designed to eliminate
induction.
Thus, the KFN series foil strain gages can accurately measure strain
under AC magnetic environments.
KFS Type:
The KFS series foil strain gages are shielded by the copper foil
covering the whole body.
Thus, if a large current flows to or around the gage bonding site,
noise is prevented from entering the measuring circuit.