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. and come in a package of 1, 3 or 12. This kit comes with 1 Hygro-i Probe and 1 Sleeve and Cap. Since this kit only comes with the probe and sleeve you will need the Hygro-i Interface Cable to be able read the readings from the probe to a Tramex moisture meter.