Bb sensors humidiity reference cells bb sensors refz 12z set2 this set contains humidity reference cells that are used for the checking and adjustment of capacitive type humidity probes the cells can also be used in scientific applications as a humidity standard each cell has a test chamber that is separated from the solution by a diaphragm so that the test sensor is not contaminated by the solution and the high quality diaphragm enables the contactless checking of measuring probes appli