

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.



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.











































