Tramex Hygro-i2 19mm Hole Liners & Caps – 100 Pack Hygro-i2® Hole Liners and Caps for use with Tramex Hygro-i2® relative humidity probes. To perform ASTM F2170 in situ RH testing of concrete floors and slabs using a 3/4″ drill bit. Hole liners 3″ long – Available in packs of 12 and 50.
