Greisinger gtf 1200 300 immersion probe type k greisinger gtf 1200 300 p the greisinger gtf 1200 300 is an immersion probe with handle type k that has been designed for taking temperature measurements of liquids gases or soft media the semi rigid probe can be used with any temperature measuring instrument that is designed to accept type k probes with a thermocouple plug p greisinger gtf 1200 300 temperature sensor