A meter is used in conjunction with a hollow, frustum-shaped disposable device to measure the concentration of an analyte in a sample of a biological fluid. The smaller end of the frustum has a porous membrane, to which a sample of the fluid may be applied. Preferably, a reagent in the membrane...http://www.google.com/patents/US5736103?utm_source=gb-gplus-sharePatent US5736103 - Remote-dosing analyte concentration meter
