Although established in the 1950s, the grindability test according to Zeisel is still one of the most important measurement techniques for the grindability of hard and brittle material. It is used intensively throughout the cement industry for testing clinker and slag, but also for limestone. Test results are applied for mill designing or capacity estimations and often form the basis for contracts for grinding equipment. The accuracy of the test strongly depends on the test parameters but also on the reliability of the employed measurement techniques. Although of high importance to the industry, these measurement techniques are not state-of-the-art. The precise measurement of grinding work by a load cell is introduced which replaces measurement by deflection and protractor.