The Rossmax Peak Flow Meter is an inexpensive, portable, handheld device for people suffering from asthma. It measures how fast air comes out of the lungs

It helps to decide if the asthma action plan works, how to adjust the medications, what triggers asthma and if the symptoms are under control or worsening.

PF120C	PF120A
Class I with measuring function Medical device
50-400 L/min	50-800 L/min
±10 L/min or ±10% of reading (whichever is greater)
±5% of reading