Disposable Peak Flow Meter Mouthpiece 100Pk specializes in reduces the risk of cross-contamination when screening multiple patients. Disposable Peak Flow Meter Mouthpiece 100Pk provides a bulk package of safety mouthpieces. The Peak Flow Meter Mouthpiece had been made for use with Personal Best, ASSESS, AsthmaMentor and AsthmaCheck peak flow meters. Disposable Peak Flow Meter Mouthpiece 100Pk is manufactured with safety in mind. The mouthpiece is engineered with a one-way valve that keeps a patient from breathing back into an machine during testing. Bulk package, contains 100 Disposable Peak Flow Meter Mouthpieces One-way valve reduces exhalation from patients during testing Improved design allows for more accurate readings during testing Compatible with multiple testing platforms.