This calibration has been performed according to ISO 835:2007 and sampling inspection of this batch has been performed according to ISO 3951. Using these criteria this batch has been accepted and it is indicated on the batch certificate.
The issue here is metrological traceability. If the manufacturer calibrated the pipette with an method that guarantess the metrological traceability, it is expected the manufacturer has an ISO/IEC 17025 accreditated method by a national metrological agency. This able the user to have traceable error determinations. We verify calibrations in my Institute since 2004, and unfortunately almost all manufacturers measured the error according to market regulation purposes which usually doesn't follow ISO/IEC 17025 principles. Another issue: when manufacturer calibrates a batch, it could calibrate only a sample of the batch! So, what we do? We've a metrology department which perfom most of our calibrations or tests. When we purchase a new equipment, first we verify if the equipment error is verified by internal quality control. If it is verified, we don't need calibrate or test (fulfilling ISO 15189 requirements). If it isn't verified, we need calibrate or test.
Paulo Pereira, Thank you very much for giving one and only reply which is informative and useful for me.
I understand that according to your reply, if this certificate has metrological traceability, it can be accepted for ISO 15189 accreditation purpose. Regarding the metrological traceability, this lot certificate indicates to control conformity according to the regulations of the German federal office for weights and measures.
As you mentioned correctly, it is a batch certificate and sampling inspection has been done according to ISO 3951.
The idea of purchasing Class A pipette by paying extra money is to do away with calibration by sending the pipette to a calibration laboratory.
Anyway, you need to keep in mind that the calibration certificate is valid for only some time, e.g. 1 year.
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