Greisinger glf 100 conductivity measuring instrument greisinger glf 100 p the greisinger glf 100 is a conductivity measuring instrument that will check the precise measurement of conductivity in pure water applications with conductivities are below 100 956 s cm p p the tough glf 100 has stainless steel measure cells each 12mm diameter and an integrated quick responding temperature sensor it is ideal for testing pure and the purest water boiler water etc p p applications freshw