Avoid contamination: use this disposable alcohol tester mouthpieces or reusable alcohol testing mouthpiece for the AlcoHAWK PT750 or PT750 with Printer(neither included) . Blood alcohol screening is easier with additional mouthpieces. This mouthpiece fits only the AlcoHAWK PT750 units.To reuse: wash thoroughly in soap and water. Rinse and air dry. Or sanitize with alcohol and let dry 24 hours prior to next use.