Abstract: A disposable measurement tip for an instrument for measuring at least one parameter of a sample, the measurement tip comprising; a tip body; a filling channel in the tip body for holding the sample to be analyzed and having an opening on one end of the tip body to receive the sample; a population of micro-particles held within the tip body filling channel and which can be mixed with the sample when the sample is received in the filling channel; wherein in use the sample in the tip is illuminated by the instrument and the illumination which impinges on the micro-particles is directed back, by the micro-particles, to the instrument to be detected and to thereby enable the at least one parameter to be determined.