Body fluid testing device

For analyzing body tank body fluid checker, comprising: aSuitable for collecting the body fluid examination medium belt (30), wherein examination medium with a belt and examination medium part, has no examined the medium congou belt part to locate in the continuous examination medium part, wherein checker further - comprising type part, wherein the supply unit comprises a shell, does not contain polluted examination medium belt; the shell is further provided with a spring the examination medium at the opening of the shell; the checker with further of the opening is enclosed environment of the sealing device; when the sealing device for closing the opening, the examination medium beltHollow belt part located between the wall and sealing device. The application further relates to a sealing device for medium box, for providing examination medium, and they during on the storage device to a method of water sealing.