In 1920, Wilhelm Cremer founded the “Zvoter-Eme-and-Rrepair-Anstalt" in Königswinter am Rhein. In those days, metering was considered an art mastered by only a few. The meter inspectors collected their first orders personally from the surrounding power plants. ZERA soon became known beyond the local borders for its ingenuity and passion for precision.

Over the years, ZERA has evolved from a meter calibration service provider into a highly specialized manufacturer of portable and stationary test equipment for all types of electricity meters and instrument transformers. Our solutions play a decisive role in shaping the technical development of testing technology.

In 1950, ZERA developed the first electromechanical flaw indicator, followed by the electronic test counter with 0.1% accuracy. At the end of the 90s, ZERA launched the first comparator with digital technology and an accuracy of 0.01%. The first primary standard, PPCS, for metrological institutes was developed in 2008. ZERA testing systems achieve the highest possible accuracy classes, which are recognized worldwide.

At the beginning of 2000, our calibration laboratory received the accreditation of the German Calibration Service (today Thank you) – an approval accepted by metrological laboratories worldwide.

Locally anchored, ZERA has long been an internationally operating company: We develop and manufacture in Germany, but we export over 80 percent of our products all over the world.

Precision begins with us. We can say that today. We know that the extraordinary successes of the past decades were only possible thanks to the people who support the company with their knowledge, ideas, and passion for quality.