Ultra-Accurate: Sonmol electronic peak flow meter with differential-pressure-type sensor measures 2 parameters PEF & FEV1. Meets the U.S. Department of Health and Human Services' Guidelines. Includes a PEF expected value calculation tool (accessed by scanning the QR code)

Risk Indicator & Customize Expected Values: Sonmol peak flow meter with LCD screen which automatically displays test values easy for you to record, you can set up your personal expected value, and each test will show your control condition with the risk indicator. * No red, yellow, or green Risk Indicators will be displayed on the device without properly setting the expected value.* No Risk Indicates will be displayed on the device without properly setting the expected value

Pocket Peak Flow Meter with Long Lifespan: This testing device is powered by 2 AAA batteries, providing up to one year of daily use. It's compact, pocket-size design allows you to conveniently carry it in your bag, enabling you to check whenever and wherever you need.

Clean and User-Friendly: Our peak flow meter features an open pipe design for easy mouthpiece cleaning and disinfection.

Applicable for: This peak flow meter is suitable for whoever concerned about their respiratory health