Pocket Peakflow Meter with Zone Markers Help your manage your asthma for peak performance in every part of your live with the POCKET PEAK peak flow meter. Lightweight and portable, reliable and accurate. So simple to use, you will monitor your peak flow every day. Adjustable Zone Indicators easily adapt meter to your care plan Reversible Adult/Pediatric Mouthpiece allows use by adults and kids. Unique Design prevents fingers from blocking indicator and exhaust ports