PT# 2.100077 PT# # 2.100077- Mouthpiece spirometer spirovit Plastic for Sp150/250 White 10/Bx by, Schiller America Inc

Perfect for my DiY educational arduino spirometer project. As a note, you get many of these in a pack.

Glad to be able to find these for less than our local medical supply.

Just what i needed.

Excellent