The Vapro Vapor Pressure Osmometer is utilized in the fields of biomedical research and clinical medicine to determine the osmolality of any type of substance, such as viscous, fluids and tissue samples. This versatile device only needs 10 microliters of a sample which means that expensive or hard-to-get samples can be assayed. Vapor pressure measurement is the optimum way to check the osmolality of a substance and this can be achieved in 90 seconds. An easy to use menu creates streamlined efficiency and various measurement modes can be selected, such as averaging mode, single sample, auto repeat mode and delayed start mode. The device can be interfaced with a computer and printer.