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The ndd Spirette Case is a single-use, disposable mouthpiece for use with any ndd spirometer. Made of smooth non-stick polyethylene, it keeps patients comfortable during testing. This quality ndd Spirette Case provides excellent docking for adults and children. Its oval shape ensures that it will fit different mouth sizes while providing optimal teeth positioning and lip seal to ensure accurate test results. Designed with a bacterial filter membrane, this case prevents cross contamination.