Specification
Product Name: Lung Capacity Tester Mouthpiece
Unit: Only
Weight :3 grams
Material: Environmentally friendly plastic that is non-toxic and odorless and can be reused after disinfection.
Specification: The diameter of the nozzle connection is 12-13MM
Lung capacity testers suitable for multiple brands and models



Packaging list: 

Lung capacity blowing mouth * 100PCS