Strain gauges with Constantan and Evan, Karma alloy foil, the resistance from 100-5000 Ohms, High Precison BF SERIES: modified phenolic backing, constantan and evan, karma foil gages, fully encapsulated, simultaneous compensation of self-temp. and self-creep, high accuracy, good stability and easy to use, good for grade 0.02 transducers.Temp.range:-30 to +80 deg CStrain limit:2.5%Fatigue life: ...