sampling pad the depression also forms a venting region allowing the escape of air bubbles from near the sampling pad which would disrupt specimen to pad contact and reduce test accuracy the oblong channel is formed during injection molding of the lid to further save manufacturing costs the pocket is shaped and dimensioned to closely envelop the test strip 11 to enhance the predictable movement of fluid up the strip by capillarity alone the strip is one of any number of commonly available chemical assay devices well known in the art which in general are made up of various porous materials for carrying chemical reagents specifically selected to test for the adequate presence of a chemical in the specimen one end of the strip is a sampling pad 32 for contacting the specimen the rest of the strip is constructed to establish a predetermined flow of the specimen from the sampling pad up through a conjugate region 33 which conjugates the sought after chemical into one which is detectable then through a membrane region 34 carrying test and control lines 35 and a terminal absorbent pad 36 maintaining the substantially vertical orientation of the strips during testing helps prevent the fluid from contacting the strip above the sampling pad 32 which can result.