This standard is concerned with the verification of clinical thermometers (mercury-in-glass) used for measuring temperature of internal human body. Other verification methods may be selected depending on the number and quality of the thermometers to be verified and the resources of the verifying authorities (personnel, equipment etc.). The method recommended below can be applied without difficulty for verifying up to 1 million thermometers a year.
GSO 665:1997 history
1997GSO 665:1997 VERIFICATION METHOD OF CLINICAL THERMOMETERS (mercury-in-glass, with maximum device)