Patent ID: 8004670

Claim:
A sample holder for a spectrophotometric analysis apparatus, said sample holder comprising: a sample reception surface having a first light transmitting region, and a sample contacting surface having a second light transmitting region, wherein the surfaces are connected for relative movement between a first position, at which the connected surfaces are spaced apart to receive a sample at the first light transmitting region, and a second position, at which the first and second light transmitting regions maintain intimate contact with and squeeze the received sample, the sample reception surface and the sample contacting surface being moveable to change a thickness of the sample between the light transmitting regions for obtaining different optical path lengths through the sample, and a sample thickness controller, which is arranged to control the distance between the sample reception surface and the sample contacting surface in the second position such that a sample thickness between the surfaces may be changed for obtaining at least two measurements of the sample at different optical path lengths through the sample, wherein the sample contacting surface is hingedly connected to the sample reception surface, wherein the sample thickness controller includes an adjustable protrusion, which extends from one of the sample reception surface or the sample contacting surface, whereby in the second position the distance between the sample reception surface and the sample contacting surface is controlled by adjusting a distance the protrusion extends from the associated surface.