The ES 4100 portable pitch measuring instrument from Donner + Pfister offers measuring data. Operational convenience is achieved by the built-in processing of the measuring data and the tip-up. According to the company's press release, the machine checks the gear teeth according to DIN or AGMA evaluation procedures. The result is displayed immediately by the apparatus itself and then stored. For documentation purposes, the result can be printed out. Existing pitch apparatuses, such as the ES401 from the MAAG Co., can also be updated by request, and the monitor is rotatable.