Body fluid testing device

A body fluid testing device for analyzing a body fluid, comprising:

• a test media tape adapted to collect the body fluid, said test media tape comprising a tape and test media portions, wherein a free tape portion without test medium is located between successive test media portions, said testing device further comprising a supply portion, wherein said supply portion comprises a housing in which uncontaminated test media tape is contained, said housing further having an opening for withdrawing test media tape from the housing, said supply portion further having a sealing means for closing said opening against the surrounding, wherein a free tape portion of said test media tape is located between a surface of the housing and the sealing means when said sealing means closes said opening, wherein the sealing means includes a deformable gasket, wherein said deformable gasket has a first and a second lip of sealing material, wherein said first lip is inclined apart from said opening and said second lip is inclined towards said opening, and wherein said sealing means has a lever for opening the sealing of the housing, the lever being actuated by tension applied to the test media tape.