The Tramex Interface Cable attaches to the Hygro-i Probe while in the concrete. The Tramex Hygro-I Probe is the most advanced and resilient RH probe on the market today. Used in conjunction with the Tramex CMEX2 or MRH3 non-destructive moisture meters the Hygro-i probe provides measurements of humidity, temperature and dew-point in structural materials such as concrete flooring, walls etc.