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.

Nascool Pre Calibrated Peak Flow Meter For Lung Fuction Monitoring

Description

🌬️ Breathe Better, Live Smarter — Your Lung’s New Best Friend

COMPACT READY TO GO - Durable, pocket-sized design fits your busy lifestyle—no disposable mouthpieces needed.
PRECISION YOU CAN TRUST - Pressure differential sensor ensures clinical-grade accuracy without the hassle of recalibration.
TRACK MANAGE LIKE A PRO - Integrated asthma diary app lets you log symptoms, triggers, and medication for smarter health decisions.
INCLUSIVE RESPIRATORY CARE - Perfect for asthma sufferers, athletes, smokers, and anyone serious about lung health from age 6+.
INSTANT LUNG HEALTH INSIGHTS - Automatically displays Peak Expiratory Flow (PEF) and Forced Expiratory Volume (FEV1) for real-time monitoring.

The Nascool Pre-Calibrated Peak Flow Meter offers high-precision lung function monitoring with no need for recalibration. It automatically displays key respiratory metrics (PEF and FEV1) and supports manual data logging via an asthma diary app. Compact and durable, it’s designed for easy use by adults and children over 6, making it ideal for asthma management, athletic performance tracking, and respiratory health monitoring.

Reviews

F**O

Excellent spirometer

I have now connected this device to my iPhone. This application works extremely well when used in conjunction with this device. I can view the data on my phone and synchronize it to the log page as well as generate charts. It's very useful.

26.05.2026

W**D

Great compact device!

As a respiratory therapist, I've used a number of peak flow meters- this one is amazing and great for home use. Small, easy to use and no moving parts. It's easily cleaned and stored, with an easy to read screen. Perfect for travel and carrying to work or school.

2.04.2026

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

C**E

If it’s too low you will not be allowed to get your allergy shots

REALLY SIMPLE TO USE

6.06.2026

M**H

Good product

Nice thing to have to keep eye on asthma. Works as expected.

20.05.2026

S**P

Digital reading is easy to read, quick to respond after using.

This is a basic digital peak flow meter. The red, yellow, green marking on it in the picture is just a marking with no function. It does register quickly and the size is easy to hold. I am working on understanding in more detail how my breathing is before and after I use medication and in between time how I am doing and the digital reading is helpful versus one that is not digital. I am not using the app as I find it easier to record it myself. Overall, it is a basic, digital peak flow meter that is easy to use.

2.06.2026

D**Y

Easy & accurate.

Easy to set up and appears accurate.

8.03.2026

A**R

Just a good peak flow meter

Works fine

7.03.2026

A**A

device wrong results

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

V**.

Muy bien medidor

Excelente aparato, descargué la app y aunque no se puede conectar x Bluetooth pones la medición y sirve muy bien

24.05.2026

D**Z

Requiero urgente de la factura

El aparato funciona bien, pero requiero una factura para comprobar ante el seguro de gastos médicos pero no puedo generarla. Necesito su ayuda

4.06.2026

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₩89403

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Best Sellers Rank	#4,505 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Flowmeters
Customer Reviews	4.3 out of 5 stars 655 Reviews

Nascool Pre-Calibrated Peak Flow Meter for Lung Fuction Monitoring

Description

Specifications

Reviews

Common Questions