Respiratoty exerciser Incentive Spirometer lung breathing trainer respiratoty exerciser: 200 400 600 800 1000 1200 Certificate Respiratory Exerciser /Incentive SpirometerModel Number: LNS-A3Certification: BS7320 FDAMaterial: PPCapacity (PER/SEC):200cc,400cc,800cc,1000cc,1200ccUsage: Training breath,do exerciser for breathing patient in hospital equipmentProduct Size (cm): 15*9.5*7.5Color: Blue, ...