Greisinger glf 175 temperature sensor probe for deep frozen products greisinger ggf 175 p the greisinger ggf 175 is a temperature sensor designed for the measurement of frozen foods and other solids the sensor takes the measurement with a v4a pipe diameter 6mm with screw points the sensor has a cross bar midway along its length making it easier to screw the sensor into the solid the 1m highly flexible silicone cable is terminated with a 3mm gold plated phono jack plug p greisinger ggf