Which of the following items in the dental operatory cannot be classified as a semi-critical item:

Critical/Non Critical instrument: Critical: Contact/penetrate/cut tissues e.g. endodontic file, scalpel Semi Critical: Which touch mucosa BUT donot cut/penetrate tissue e.g. air/water syringe tip, suction tip, handpiece Non-Critical: Surface disinfection is adequate e.g. X-ray stand, light source