A test strip is provided for determining the presence or quantity of an analyte in a liquid by inserting the strip into an optical reading apparatus. The test strip is provided with an orientation index zone having a reflectance that contrasts with the reflectance of areas contiguous thereto and such...http://www.google.es/patents/US6491870?utm_source=gb-gplus-sharePatente US6491870 - Optically readable strip for analyte detection having on-strip orientation index
Optically readable strip for analyte detection having on-strip orientation index
