HI 70602 Relative Humidity Probe, 1 m cable HANNA humidity probes utilize a high-tech Thin-Film Polymer Capacitance (TFPC) humidity sensor. This sensor enables rapid response and high accuracy. For rapid response, HANNA recommends a probe with a perforated cap. For industrial environments with dust and powders, HANNA recommends a probe with a protective sintered cap. Read More »