POCKETPEAK so compact and easy to use, and comes complete with durable, sliding zone indicators. Colored markers allow patients to easily monitor changes in airflow, and healthcare professionals to recommend a treatment plan of action when readings fall in the red, yellow or green zones. POCKETPEAK Peak Flow Meter meets or exceeds all National Asthma Education Program and National Heart, Lung, Blood, Institute standards. ABS plastic housing and tempered stainless steel vane are completely dishwasher-safe. Cleaning the POCKETPEAK and reusable mouthpiece is easy and worry-free. POCKETPEAK's ergonomic design reduces user confusion and misuse. The reusable mouthpiece is reversible for smaller mouths and attaches to the POCKETPEAK for secure storage. 1 Each / Each