A disposable test device consists of a first portion 2 having a fluid application port 5 to which a sample of fluid can be applied, and a handle portion 3 hingedly attached to the first portion 2 at a hinge portion 4 and which normally lies in the plane of the first portion. In use the device is held by the handle portion 3 and the first portion inserted into a measuring instrument. The handle is then deflected downwardly e.g. by the finger of a person to supply a drop of fluid to the port 5.