1. Why do the test values vary significantly?

Usage methods and physical conditions can affect the results. Airflow blockage may cause PEF deviations. 1) Did not inhale deeply or exhale forcefully and correctly; 2) Respiratory muscle fatigue; 3) Leakage from the mouth or nose, etc.

2. 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

3. E1 occur while using?

Please restart the peak flow meter. If the E1 problem still persists, please get in touch with us. After confirm, we could send you a replacement.

Why can't I connect the device to Bluetooth or Sync data to the App?

This peak flow meter has no Bluetooth and cannot sync data to the 'ePEF' app. Manually log your readings instead.

Why there no backlight red, yellow or green?

This item do not have backlight. There is a triangular pointing to the red, yellow, or green sections for each test result * No arrow will be displayed on the device without properly setting the expected value.

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Reseñas

C**M

Great value

Seems to work well, great value.

27.12.2025

J**S

Peak Flow Meter

The product is easy to use and instructions are easily understood.

25.11.2025

N**E

Great for the Price

My doctor recommended I get a peak flow monitor due to my asthma issues. This monitor works great for the price. It beeps kind of loudly when you turn it on and it beeps when it automatically turns off. Unfortunately you can’t turn it off with the power button (it only turns the device on) but since it shuts off automatically after not using, there’s no issues with battery life. You can set up the device phone app to feed into your Apple health data which is great.

18.12.2025

K**E

Works well and EZPZ

Daughter recently diagnosed with asthma. This is an accurate and easy to use. App is nice too.

26.08.2025

P**R

Good price and reads well

works as expected. setup was a breeze but the app is pretty basic don't expect much out of it. Make sure what ever you buy is not just wifi but also automatically transfers the data. there are many others that have a low price but are manual and the descriptions are deceiving

28.05.2025

D**.

Great

It's my first one, and it works like they said it would every time

4.01.2026

C**N

Durable

Very nice and durable product. Very user-friendly to set up.

23.08.2025

C**E

Accurate? though, very consistent readings which is helpful & important

I'm not sure how accurate this is when compared to my PFT test results from December 2024. However, this peak flow meter seems very consistent for me. Thus, I will continue using it. It will help me determine if things are staying the same, improving or worsening over time. I'm glad I bought this.

5.04.2025

A**A

i have bought this device for my son he has asthma,It is showing always wrong results and i have tried so many times to connect to my phone but cannot find my phone.... i dont know i think its a waste of money and time i will try to return this device

22.10.2025

ASIN	B09S3KJZZ7
Best Sellers Rank	#2,925 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Flowmeters
Customer Reviews	4.3 4.3 out of 5 stars (583)
Date First Available	February 9, 2022
Item model number	SMPF-2S
Manufacturer	Nascool
Product Dimensions	2 x 1.7 x 4 inches; 4.23 ounces

Digital Peak Flow Meter,Home Medical with Tracking Software Manually Recording-Accurate & Reliable Spirometer for Asthma COPD Adult Kids

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