Bb sensors anodised aluminium housings with end caps bb sensors geh apg t1 c1 b an anodised aluminium housing with black polyamide end caps internally there are three indents for inserting pcbs of 16mm thickness and the interior size is chosen such that the overall height is sufficient for standard components such as connectors typical applications include modems data acquisition modules interface converter etc bb sensors geh apg t1 c1 b aluminium housing