I work with a company that produces different types of ice cream ingredients. We have metal detector as one of our CCPs and we need to do an annual validation of the metal detector. Is it compulsory that we use a third party for the validation? Do we need to get a certificate of validation? If yes, do we need the certificate for each of our products? If we don't have to use a third party, what is the best way to do the calibration ourselves and what documentation do we need as records for audit?
Thanks in advance!