A heated platen assembly for use in a biological testing device is disclosed having a heated platen defining a plurality of optical openings configured to permit radiation to pass through the heated platen, a light transmissive slip cover configured to cover at least one of the plurality of optical openings,...http://www.google.com/patents/US7560273?utm_source=gb-gplus-sharePatent US7560273 - Slip cover for heated platen assembly
