NOTE For metrological requirements, maximum permissible errors, requirements for marking and information to be provided for users for piston-operated volumetric apparatus, see ISO 8655‑2 for piston pipettes, see ISO 8655‑3 for piston burettes, see ISO 8655‑4 for dilutors and see ISO 8655‑5 for dispensers. Conformity testing (type evaluation) of piston-operated volumetric apparatus is given in ISO 8655‑3. Alternative test methods such as photometric and titrimetric methods are given in ISO 8655‑7. For all other tests (e.g. quality assurance by the supplier, analytical and measuring equipment quality assurance by the user) see ISO 8655‑6 or alternative test methods.