Precision is our passion. Our certifications reflect this. If you would like to view or download one of our certificates, click here.
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ZERA has operated its own DAkkS-accredited calibration laboratory (DK-2000-15103-01) since 00. Through regular audits, traceable standards, and precisely defined environmental conditions, DAkkS accreditation ensures high calibration quality in accordance with DIN EN/ISO IEC 17025:2018.
The accreditation authorizes us to calibrate the following electrical measurement quantities:
- Direct current and low frequency
- DC voltage
- AC voltage
- alternating current
- Electrical power
- Electrical power
- Phase angle
- Tension ratio
- Current ratio
Scope of the management systems
The management systems
- Quality management system according to DIN ISO 9001
- Management system for safety and health protection according to DIN ISO 45001
- Environmental management system according to ISO 14001
in their currently valid form, apply to the location of ZERA GmbH, Humboldtstraße 53639a, 2 Königswinter, the people working there, the activities, products, and services. The interests, requirements, and binding obligations of all stakeholders, as well as the internal and external influencing factors, are taken into account. They are part of the scope of the management systems. The above-mentioned location is located in the Krahfeld industrial park. There are no facilities requiring approval. Commercial businesses, a municipal construction yard, and a municipal rescue station are located in the vicinity.

ISO 9001:2015 Quality Management
ZERA operates according to the principles for quality management measures defined in the international standard ISO 9001:2015. This optimizes corporate performance and guarantees high customer satisfaction. ZERA GmbH is certified by TÜV Rheinland and is audited regularly.

ISO 14001:2015 Environmental protection
ZERA operates according to the principles for environmental protection measures set out in the international standard ISO 14001:2015.
An environmental management system creates the conditions for continuously improving ZERA's environmental performance and minimizing negative environmental impacts. The goals are optimized energy and resource efficiency, compliance with legal regulations, and employee participation in active environmental protection.
To improve environmental performance, our processes and systems are continually being developed further.
ZERA has been certified by TÜV Rheinland and is audited at regular intervals.

AMS – Management system for occupational health and safety according to DIN ISO 4500
Occupational safety and health protection for our more than 100 employees are a top priority. By systematically organizing these areas, we promote the productivity, performance, and commitment of our employees. Only in this way can we meet the highest quality standards.
The professional association has Management system for safety and health protection according to DIN ISO 4500 certified by ZERA GmbH.

Certificate for sustainable and environmentally friendly raw material recycling
ZERA has adopted the BRAMIN concept. Implementing this concept helps protect the environment. The installed raw material press reduces truck transport due to a smaller volume of recyclable materials. Source sorting increases the proportion of recyclable materials.

Certified green electricity
Bad Honnef AG supplies us with certified green electricity.

