The µOSMETTE is a precise instrument for measuring freezing point depression. Since the freezing point of a solution is a measure of the solution's concentration, the OSMETTE provides a simple, but very accurate method for concentration or osmotic pressure measurements. The OSMETTE is, therefore, a freezing point osmometer. The uses of the OSMETTE include quality control of aqueous solutions during their manufacture, determination of the solute concentration of various biological solutions, and determination of average molecular weight of a solute weighed into a known weight of solvent. Since these determinations can be made by measuring the freezing point of a solution (a colligative property), the OSMETTE's function is to make a freezing point measurement in a very simple, precise and quick manner.