History
In 1920 Wilhelm Cremer founded the “Zähler-Eich-und-Reparatur-Anstalt“(Meter-Calibration-and-Repair-Institute) in Königswinter on the Rhine. At that time, calibration was an art that only very few mastered. The meter auditors personally went out and got their first contracts with the utilities in the area. Soon ZERA became known beyond the region for their ingenuity and their penchant for precision.
From service provider for meter calibration, over the years ZERA developed into a highly specialized producer of portable and stationary testing technology for all kinds of electricity meters and instrument transformers. Our solutions have significantly influenced the technological development of testing technology.
![zera-gebaeude-building-1920](https://www.zera.de/wp-content/uploads/zera-gebaeude-building-1920.jpg 800w, https://www.zera.de/wp-content/uploads/zera-gebaeude-building-1920-768x343.jpg 768w, https://www.zera.de/wp-content/uploads/zera-gebaeude-building-1920-600x268.jpg 600w, https://www.zera.de/wp-content/uploads/zera-gebaeude-building-1920-150x67.jpg 150w)
In 1950, ZERA developed the first electromechanical error indicator, followed by the electronic testing meter with 0.1% accuracy. At the end of the 90s, ZERA put the first comparator with digital technology and an accuracy of 0.01% on the market. The first primary standard PPCS for metrological institutes was created in 2008. ZERA’s test systems achieved the highest possible accuracy classes that found recognition worldwide.
Starting in 2000, our calibration laboratory received the accreditation from Germany’s National Accreditation Body (today DAkkS) – an approval that metrological laboratories accept worldwide.
Although locally established, ZERA has meanwhile become an internationally operating company: We develop and produce in Germany; however we export over 80 % of our products all over the world.
Precision starts with us. Today we can truly say this. We know that the extraordinary success of the past decades has only been possible thanks to the people that support the company with their knowledge, their ideas and their passion for quality.
Tradition & Quality
As much as the markets have changed over the past 100 years, our corporate values have remained the same: An uncompromising commitment to the highest accuracy and quality, absolute reliability and convincing customer proximity. We know the industry and the needs of our customers from decades of experience. Our engineers and consultants see individual requirements through the eyes of our customers and develop innovative solutions that fit seamlessly into existing processes. Our quality promise Made & Managed in Germany applies not only to our products, but also to our competent advice and qualified service.
We develop and produce in Germany because this is where we find the qualified employees we need – from trainees to engineers. In a climate of appreciation and recognition, many of them have been working in our ranks for decades. 40-year anniversaries are not uncommon. Some families have been with us for generations. In this sense, we are a family business in the truest sense of the word.
We benefit daily from the dedication of our employees and their commitment to our company.
![Zera Gruendung 1920 Unternehmensgruendung Reparaturanstalt Business](https://www.zera.de/wp-content/uploads/zera-gruendung-1920-Unternehmensgruendung-Reparaturanstalt-business.jpg 618w, https://www.zera.de/wp-content/uploads/zera-gruendung-1920-Unternehmensgruendung-Reparaturanstalt-business-447x600.jpg 447w, https://www.zera.de/wp-content/uploads/zera-gruendung-1920-Unternehmensgruendung-Reparaturanstalt-business-600x805.jpg 600w, https://www.zera.de/wp-content/uploads/zera-gruendung-1920-Unternehmensgruendung-Reparaturanstalt-business-150x201.jpg 150w)
1920 - Hauptstrasse 392
Zähler-Eich- und Reparaturanstalt
Business areas: Maintenance and calibration of meters, repair and sale of repaired meters.
![G62 Rotating Watt Hour Meter 1925 5cm Sw](https://www.zera.de/wp-content/uploads/G62_rotating-watt-hour-meter-1925_5cm-sw.jpg 1041w, https://www.zera.de/wp-content/uploads/G62_rotating-watt-hour-meter-1925_5cm-sw-410x600.jpg 410w, https://www.zera.de/wp-content/uploads/G62_rotating-watt-hour-meter-1925_5cm-sw-699x1024.jpg 699w, https://www.zera.de/wp-content/uploads/G62_rotating-watt-hour-meter-1925_5cm-sw-768x1124.jpg 768w, https://www.zera.de/wp-content/uploads/G62_rotating-watt-hour-meter-1925_5cm-sw-600x878.jpg 600w, https://www.zera.de/wp-content/uploads/G62_rotating-watt-hour-meter-1925_5cm-sw-150x220.jpg 150w)
1925 - Rotating watt hour meter
![G 63 Rotating Watt Hour Meter 1930](https://www.zera.de/wp-content/uploads/G-63_rotating-watt-hour-meter-1930.jpg 945w, https://www.zera.de/wp-content/uploads/G-63_rotating-watt-hour-meter-1930-480x600.jpg 480w, https://www.zera.de/wp-content/uploads/G-63_rotating-watt-hour-meter-1930-819x1024.jpg 819w, https://www.zera.de/wp-content/uploads/G-63_rotating-watt-hour-meter-1930-768x961.jpg 768w, https://www.zera.de/wp-content/uploads/G-63_rotating-watt-hour-meter-1930-600x750.jpg 600w, https://www.zera.de/wp-content/uploads/G-63_rotating-watt-hour-meter-1930-150x188.jpg 150w)
1930 - Rotating watt hour meter
![Zera Historie Instandhaltung Eichung Reisende Revisoren](https://www.zera.de/wp-content/uploads/zera-historie-instandhaltung-eichung-reisende-revisoren.jpg 700w, https://www.zera.de/wp-content/uploads/zera-historie-instandhaltung-eichung-reisende-revisoren-600x435.jpg 600w, https://www.zera.de/wp-content/uploads/zera-historie-instandhaltung-eichung-reisende-revisoren-150x109.jpg 150w)
Office
Repairs were handled out by the workshop in Königswinter.
![G 67 Rotating Watt Hour Meter 1942](https://www.zera.de/wp-content/uploads/G-67_rotating-watt-hour-meter-1942.jpg 1039w, https://www.zera.de/wp-content/uploads/G-67_rotating-watt-hour-meter-1942-410x600.jpg 410w, https://www.zera.de/wp-content/uploads/G-67_rotating-watt-hour-meter-1942-699x1024.jpg 699w, https://www.zera.de/wp-content/uploads/G-67_rotating-watt-hour-meter-1942-768x1125.jpg 768w, https://www.zera.de/wp-content/uploads/G-67_rotating-watt-hour-meter-1942-600x879.jpg 600w, https://www.zera.de/wp-content/uploads/G-67_rotating-watt-hour-meter-1942-150x220.jpg 150w)
1942 - Rotating watt hour meter
![Zera Historie Pruefraeume](https://www.zera.de/wp-content/uploads/zera-historie-pruefraeume.jpg 789w, https://www.zera.de/wp-content/uploads/zera-historie-pruefraeume-768x497.jpg 768w, https://www.zera.de/wp-content/uploads/zera-historie-pruefraeume-600x389.jpg 600w, https://www.zera.de/wp-content/uploads/zera-historie-pruefraeume-150x97.jpg 150w)
One of the first test facilities at ZERA
![Zera Hitorische Pruefraeume History Electric Engineering](https://www.zera.de/wp-content/uploads/zera-hitorische-pruefraeume-history-electric-engineering.jpg 758w, https://www.zera.de/wp-content/uploads/zera-hitorische-pruefraeume-history-electric-engineering-600x401.jpg 600w, https://www.zera.de/wp-content/uploads/zera-hitorische-pruefraeume-history-electric-engineering-150x100.jpg 150w)
View of the historical production facilities
![Zera Elektromechanischer Fehlerzeiger Fa3 1951](https://www.zera.de/wp-content/uploads/zera-elektromechanischer-fehlerzeiger-fa3-1951.jpg 443w, https://www.zera.de/wp-content/uploads/zera-elektromechanischer-fehlerzeiger-fa3-1951-150x198.jpg 150w)
1951
![1959 Prüfbank](https://www.zera.de/wp-content/uploads/1959-Pruefbank.jpg 872w, https://www.zera.de/wp-content/uploads/1959-Pruefbank-713x600.jpg 713w, https://www.zera.de/wp-content/uploads/1959-Pruefbank-768x646.jpg 768w, https://www.zera.de/wp-content/uploads/1959-Pruefbank-600x505.jpg 600w, https://www.zera.de/wp-content/uploads/1959-Pruefbank-150x126.jpg 150w)
Meter test bench with wooden housing 1955
![G 70 Rotating Watt Hour Meter 1959 5cm](https://www.zera.de/wp-content/uploads/G-70_rotating-watt-hour-meter-1959_5cm.jpg 368w, https://www.zera.de/wp-content/uploads/G-70_rotating-watt-hour-meter-1959_5cm-150x241.jpg 150w)
1959 - Rotating watt hour meter
![Olympus Digital Camera](https://www.zera.de/wp-content/uploads/Ferraris-meter-1969-frontal_5cm_RGB.jpg 379w, https://www.zera.de/wp-content/uploads/Ferraris-meter-1969-frontal_5cm_RGB-150x234.jpg 150w)
1969 Ferraris meter
Electromechanical meter and register (mechanical drum-type register)
![Zera Zaehlerpruefeinrichtung 1970 Historie](https://www.zera.de/wp-content/uploads/zera-zaehlerpruefeinrichtung-1970-historie.jpg 757w, https://www.zera.de/wp-content/uploads/zera-zaehlerpruefeinrichtung-1970-historie-714x600.jpg 714w, https://www.zera.de/wp-content/uploads/zera-zaehlerpruefeinrichtung-1970-historie-600x504.jpg 600w, https://www.zera.de/wp-content/uploads/zera-zaehlerpruefeinrichtung-1970-historie-150x126.jpg 150w)
Meter test bench 1970
EPZ301- 1972
![Olympus Digital Camera](https://www.zera.de/wp-content/uploads/1-ph-meter-1979-frontal.jpg 1523w, https://www.zera.de/wp-content/uploads/1-ph-meter-1979-frontal-544x600.jpg 544w, https://www.zera.de/wp-content/uploads/1-ph-meter-1979-frontal-928x1024.jpg 928w, https://www.zera.de/wp-content/uploads/1-ph-meter-1979-frontal-768x847.jpg 768w, https://www.zera.de/wp-content/uploads/1-ph-meter-1979-frontal-1392x1536.jpg 1392w, https://www.zera.de/wp-content/uploads/1-ph-meter-1979-frontal-600x662.jpg 600w, https://www.zera.de/wp-content/uploads/1-ph-meter-1979-frontal-150x165.jpg 150w)
1979 Alternating current meter
Electromechanical meter and register (drum-type register)
![Zera Ilmo3 Einphasiger Thermischer Komparator Historie](https://www.zera.de/wp-content/uploads/zera-ILMO3-einphasiger-thermischer-komparator-historie.jpg 472w, https://www.zera.de/wp-content/uploads/zera-ILMO3-einphasiger-thermischer-komparator-historie-150x83.jpg 150w)
ILM03 - 1981
![Zera Dossam Anlagensteuerung Pc 1990](https://www.zera.de/wp-content/uploads/zera-DOSSAM-anlagensteuerung-pc-1990.jpg 546w, https://www.zera.de/wp-content/uploads/zera-DOSSAM-anlagensteuerung-pc-1990-150x149.jpg 150w)
DOSSAM - 1990
![Olympus Digital Camera](https://www.zera.de/wp-content/uploads/zera-hybridzaehler-rollenzaehlwerk-wattstundenzaehler-1991.jpg 259w, https://www.zera.de/wp-content/uploads/zera-hybridzaehler-rollenzaehlwerk-wattstundenzaehler-1991-150x215.jpg 150w)
1991 Hybrid meter
Electronic meter and electromechanical meter (mechanical drum-type register)
![Olympus Digital Camera](https://www.zera.de/wp-content/uploads/zera-messwandlerzaehler-elektromechanisches-zaehlwerk-1994.jpg 206w, https://www.zera.de/wp-content/uploads/zera-messwandlerzaehler-elektromechanisches-zaehlwerk-1994-150x280.jpg 150w)
1994 CT operated meter
Electro-mechanical meter, electronic data processing
![Olympus Digital Camera](https://www.zera.de/wp-content/uploads/zera-messwandlerzaehler-tarifstruktur-1996.jpg 249w, https://www.zera.de/wp-content/uploads/zera-messwandlerzaehler-tarifstruktur-1996-150x236.jpg 150w)
1996 CT operated meter
![Olympus Digital Camera](https://www.zera.de/wp-content/uploads/10206240_ID10705-ZPE_2000.jpg 2000w, https://www.zera.de/wp-content/uploads/10206240_ID10705-ZPE_2000-800x600.jpg 800w, https://www.zera.de/wp-content/uploads/10206240_ID10705-ZPE_2000-1365x1024.jpg 1365w, https://www.zera.de/wp-content/uploads/10206240_ID10705-ZPE_2000-768x576.jpg 768w, https://www.zera.de/wp-content/uploads/10206240_ID10705-ZPE_2000-1536x1152.jpg 1536w, https://www.zera.de/wp-content/uploads/10206240_ID10705-ZPE_2000-600x450.jpg 600w, https://www.zera.de/wp-content/uploads/10206240_ID10705-ZPE_2000-150x113.jpg 150w)
Meter test bench 2000
![Winsam Editor 2002](https://www.zera.de/wp-content/uploads/WinSAM-Editor_2002.jpg 896w, https://www.zera.de/wp-content/uploads/WinSAM-Editor_2002-800x539.jpg 800w, https://www.zera.de/wp-content/uploads/WinSAM-Editor_2002-768x518.jpg 768w, https://www.zera.de/wp-content/uploads/WinSAM-Editor_2002-600x404.jpg 600w, https://www.zera.de/wp-content/uploads/WinSAM-Editor_2002-150x101.jpg 150w)
WinSAM - 2002
![Com 3003 Montage Rgb](https://www.zera.de/wp-content/uploads/Com_3003_montage_RGB.jpg 1181w, https://www.zera.de/wp-content/uploads/Com_3003_montage_RGB-800x407.jpg 800w, https://www.zera.de/wp-content/uploads/Com_3003_montage_RGB-768x391.jpg 768w, https://www.zera.de/wp-content/uploads/Com_3003_montage_RGB-600x305.jpg 600w, https://www.zera.de/wp-content/uploads/Com_3003_montage_RGB-150x76.jpg 150w)
COM3003 - 2003
![2004 Mt3000](https://www.zera.de/wp-content/uploads/2004-MT3000.jpg 828w, https://www.zera.de/wp-content/uploads/2004-MT3000-692x600.jpg 692w, https://www.zera.de/wp-content/uploads/2004-MT3000-768x666.jpg 768w, https://www.zera.de/wp-content/uploads/2004-MT3000-600x520.jpg 600w, https://www.zera.de/wp-content/uploads/2004-MT3000-150x130.jpg 150w)
MT3000 - 2004
Developed in 2002 and received the reddot design award in 2004.
2004 eHZ meter
Electromechanical meter and register, highly simplified tariff structure, remote disconnection
![Logo Zera India Rgb](https://www.zera.de/wp-content/uploads/Logo-ZERA-India-RGB.jpg 354w, https://www.zera.de/wp-content/uploads/Logo-ZERA-India-RGB-150x60.jpg 150w)
ZERA India - 2005
![Olympus Digital Camera](https://www.zera.de/wp-content/uploads/zera-AMIS-zaehler-2005.jpg 323w, https://www.zera.de/wp-content/uploads/zera-AMIS-zaehler-2005-150x181.jpg 150w)
2005/2006 AMIS meter
PPCS - 2008
![Olympus Digital Camera](https://www.zera.de/wp-content/uploads/zera-EDL-zaehler-dreipunkt.jpg 275w, https://www.zera.de/wp-content/uploads/zera-EDL-zaehler-dreipunkt-150x211.jpg 150w)
2010 EDL meter
EDL21 and EDL40 eHZ or three-point construction
![Olympus Digital Camera](https://www.zera.de/wp-content/uploads/WM3000U_Front_2010.jpg 2000w, https://www.zera.de/wp-content/uploads/WM3000U_Front_2010-800x354.jpg 800w, https://www.zera.de/wp-content/uploads/WM3000U_Front_2010-1680x744.jpg 1680w, https://www.zera.de/wp-content/uploads/WM3000U_Front_2010-768x340.jpg 768w, https://www.zera.de/wp-content/uploads/WM3000U_Front_2010-1536x680.jpg 1536w, https://www.zera.de/wp-content/uploads/WM3000U_Front_2010-600x266.jpg 600w, https://www.zera.de/wp-content/uploads/WM3000U_Front_2010-150x66.jpg 150w)
WM3000 - 2010
![Zera Basiszaehler](https://www.zera.de/wp-content/uploads/zera-basiszaehler.jpg 274w, https://www.zera.de/wp-content/uploads/zera-basiszaehler-150x201.jpg 150w)
2013 Basiszähler (electrical energy meter)
![Com5003 Front Echtewerte 2016](https://www.zera.de/wp-content/uploads/COM5003_Front_echteWerte_2016.jpg 2000w, https://www.zera.de/wp-content/uploads/COM5003_Front_echteWerte_2016-800x382.jpg 800w, https://www.zera.de/wp-content/uploads/COM5003_Front_echteWerte_2016-1680x803.jpg 1680w, https://www.zera.de/wp-content/uploads/COM5003_Front_echteWerte_2016-768x367.jpg 768w, https://www.zera.de/wp-content/uploads/COM5003_Front_echteWerte_2016-1536x734.jpg 1536w, https://www.zera.de/wp-content/uploads/COM5003_Front_echteWerte_2016-600x287.jpg 600w, https://www.zera.de/wp-content/uploads/COM5003_Front_echteWerte_2016-150x72.jpg 150w)
COM5003 - 2016
![Zerycon Logo Web](https://www.zera.de/wp-content/uploads/ZERYCON-Logo_Web.jpg 876w, https://www.zera.de/wp-content/uploads/ZERYCON-Logo_Web-800x526.jpg 800w, https://www.zera.de/wp-content/uploads/ZERYCON-Logo_Web-768x505.jpg 768w, https://www.zera.de/wp-content/uploads/ZERYCON-Logo_Web-600x395.jpg 600w, https://www.zera.de/wp-content/uploads/ZERYCON-Logo_Web-150x99.jpg 150w)
Foundation of ZERYCON GmbH 2017
![Zera Stm6000 Serie Digitales Messsystem Kommunikation Metrologie Historie](https://www.zera.de/wp-content/uploads/zera-STM6000-serie-digitales-messsystem-kommunikation-metrologie-historie.jpg 578w, https://www.zera.de/wp-content/uploads/zera-STM6000-serie-digitales-messsystem-kommunikation-metrologie-historie-150x112.jpg 150w)
STM6000 series - 2018
![Zera Standort Relocation Koenigswinter Gebaeude](https://www.zera.de/wp-content/uploads/zera-standort-relocation-koenigswinter-gebaeude.jpg 685w, https://www.zera.de/wp-content/uploads/zera-standort-relocation-koenigswinter-gebaeude-600x264.jpg 600w, https://www.zera.de/wp-content/uploads/zera-standort-relocation-koenigswinter-gebaeude-150x66.jpg 150w)
New location - 2019
Relocation to new premises in Königswinter-Oberpleis
![Zeras S2 Serie Tragbarer Pruefzaehler Zaehlerpruefung Historie](https://www.zera.de/wp-content/uploads/zeras-s2-serie-tragbarer-pruefzaehler-zaehlerpruefung-historie.jpg 650w, https://www.zera.de/wp-content/uploads/zeras-s2-serie-tragbarer-pruefzaehler-zaehlerpruefung-historie-600x431.jpg 600w, https://www.zera.de/wp-content/uploads/zeras-s2-serie-tragbarer-pruefzaehler-zaehlerpruefung-historie-150x108.jpg 150w)
s2 series - 2019
Launch of the s2 series – a new generation of portable meter testing.
![Smartmeter Mit Gw 2020](https://www.zera.de/wp-content/uploads/SmartMeter-mit-Gw_2020.jpg 388w, https://www.zera.de/wp-content/uploads/SmartMeter-mit-Gw_2020-150x155.jpg 150w)
2020 Smart Meter Gateway (SMGw)
![](https://www.zera.de/wp-content/uploads/zera-emob32-prueftechnik-pruefkoffer-ac-ladestationen.jpg 500w, https://www.zera.de/wp-content/uploads/zera-emob32-prueftechnik-pruefkoffer-ac-ladestationen-400x400.jpg 400w, https://www.zera.de/wp-content/uploads/zera-emob32-prueftechnik-pruefkoffer-ac-ladestationen-300x300.jpg 300w, https://www.zera.de/wp-content/uploads/zera-emob32-prueftechnik-pruefkoffer-ac-ladestationen-150x150.jpg 150w)