Greisinger grs 3100 rs232 interface converter greisinger grs 3100 p the greisinger grs 3100 is an rs232 interface converter for an electrically isolated connection of the gmh 3100 to the rs232 interface of a pc this cable then allows the data transmission between devices the grs 3100 is suitable for the handheld pressure meter gmh 3150 gmh and material moisture meter hf 3830 gmh 3830 gmh 3850 602175 p greisinger grs 3100 rs232 interface converter compatible with gmh 315