A method of using an oximeter sensor assembly including the steps of detecting light from a light emitting element and storing digital data in a memory associated with the sensor assembly. The outer panel and the tubular framework are joined directly together by welding. The air input device adds air to the pneumatic cylinders, causing the lifting arms to move from the retracted to an extended configuration, thus raising the tire and wheel. Highly enriched populations of cardiomyocytes and their replicating precursors can be obtained, suitable for use in a variety of applications, such as drug screening and therapy for cardiac disease. The second end defines a second planar end surface.