Why do the test values vary significantly?

Usage methods and physical conditions can affect the results. Airflow blockage may cause PEF deviations. 1. Not inhaling deeply or exhaling forcefully and correctly 2. Respiratory muscle fatigue 3. Leakage from the mouth or nose

How to avoid noticeable deviation test value among each tests?

1. Stand or sit upright before testing. 2. Take a deep breath in 3. Exhale forcefully and as quickly as possible 4. Seal the mouthpiece tightly 5. Take a short break between tests to avoid fatigue and ensure accurate results

Why can't I connect to Bluetooth?

1. Please keep the peak flow meter device powered on 2. Please keep you phone's Bluetooth on. 3. For Android systems, please grant the location permission for the Digital ePEF App. For iOS systems, this is not required.

ASIN	B0CKXQTPQN
ASIN	B0CKXQTPQN
Brand	Sonmol
Customer Reviews	4.4 4.4 out of 5 stars (142)
Customer reviews	4.4 4.4 out of 5 stars (142)
Date First Available	24 June 2025
Item model number	SMPF-2S
Manufacturer	Sonmol
Package Dimensions	19.2 x 7.29 x 5.99 cm; 191 g
Units	1.0 Count

Upgraded Spirometer with Risk Indicator and 300 Record Storage, Portable Max Flow Meter with Bluetooth Tracking and Testing App, PEF and FEV1, EPOC Asthma Monitor

Description

Specifications

Common Questions