These are highly stable strain calibrators used for operation check and sensitivity calibration of static and dynamic strainmeters (bridge excitation frequency of 20 kHz or lower). Bridge resistances are 120 Ω for CBM-122A, and 350 Ω for CBM-352A, and calibration by full bridge method is possible.
CBM-122A/CBM-352A (±100 to ±40000x10-6 strain)