Quality control at Zeros GmbH – visual and dimensional inspections to inspection plans, evaluation and documentation – is not itself an accredited test method; dimensional inspections are performed outside the accredited scope. Where inspection needs to go deeper, Zeros draws directly on its own testing laboratory: the associated non-destructive and destructive tests such as visual testing (VT), magnetic particle and penetrant testing, hardness testing (Brinell/Vickers) or tensile testing are performed in the testing laboratory accredited to DIN EN ISO/IEC 17025. The NDT personnel are certified in accordance with DIN EN ISO 9712.