The high-precision procedures used in microscope production also included precise measurements and checks of the parts and tools employed during the production process. Right from the experimental stages of his The splitting of Carl Zeiss into two parts also marked a significant turning point for the precision measuring business, with one precision measuring department now in East Germany, and one in West Germany. However, major elements of the division's foundations had simply collapsed. The division's leading lights, above all its former Head, Dr. Kurt Räntsch, were among the Carl Zeiss employees brought to Heidenheim by the Americans. During the 1950s and 1960s, both precision measuring departments developed high-quality measuring instruments independent of each other. In 1974, a team headed by the former lab manager Klaus Herzog began to focus on innovative instruments providing electronic output of measurements and numerical control. As early as 1972, the Precision Measuring Department was already working on a 3D coordinate measuring machine, and in 1973 the UMM 500 Universal Measuring Machine was introduced at the “Microtecnic” trade fair in Zurich, Switzerland. The impact of the UMM 500 forged a strong link between the development of modern industrial metrology and the name Carl Zeiss. Based on the changing conditions in the field of metrology and the department's new profile, the Precision Measuring Department was renamed to Industrial Metrology (IMT) in 1977.