Greisinger humidity measuring device grhu 1r 1k 2k greisinger grhu 1k mp the greisinger grhu 2k mp is a humidity transmitter that includes the sensor this sensor has been designed for duct mounting applications with the sensor tube downwards the sensor module is particularly suitable for industrial usage due to its robust surface mounted housing making it appropriate for almost all applications greisinger grhu 1k mp thermo hygrometer