Mr. Lange has been auditing us for many years in the area of quality management ISO 13485:2016. We are a critical supplier of implantable medical devices in Class IIb and III. During the many audits, Mr. Lange has helped us to improve our quality management system every year. In supplier audits, Mr. Lange's strict and fair auditing has been confirmed, as a result of which we have not received any non conformitys. (Medical Device Company)

We were surprised by Mr. Lange and his wealth of experience during the first audit. The CV provided by the certification body and his young age initially gave us cause for concern. He successfully led the large audit team and adhered to the audit plan. In preparation, Mr. Lange made enquiries about our circumstances and drew up a detailed audit plan. We were not previously aware of this audit planning. He was active in the readiness assessment for ISO 140001 and ISO 45001. The non-conformities were discussed at the end of the audit and are very comprehensible and justified for us.  (Public authority)

Mr. Lange has been auditing us in the various standards as co- and lead auditor since 2013. His audit report documentation is very detailed and without any significant errors. We have revised our processes in the area of internal auditing at our sites following a non- conformity. It is worth mentioning that Mr. Lange assessed the effectiveness and practical implementation in great detail in the subsequent audit. (Industrial Company in the area of machining)