KELLER is known for Swiss quality and precision. Since the company was founded, all products have been developed and manufactured at the headquarters in Winterthur. Native-speaking sales engineers provide competent advice and more than 450 employees contribute to the company's success worldwide. All this makes KELLER the leading manufacturer of pressure sensors and pressure transmitters, certified according to ISO 9001. The production and sale of more than 1.2 million pressure measuring cells per year is the core competence of KELLER AG. The high-quality measuring cells are also processed into consumer products such as level probes, data loggers or manometers. Thanks to pressure ranges from 5 mbar to 2000 bar and a wealth of experience, KELLER products cover an enormously wide range of requirements. The focus is on customer requirements. To find suitable solutions for individual applications, we combine over 45 years of experience with innovative spirit.