IMPORTANT: The most common issue we are seeing with meters not working correctly (phone recognizes meter, but doesn’t take a reading) is caused from dirt and debris in the headphone jack opening. Please have your phone serviced professionally or search online instructional videos on how to clean the headphone jack.
Our meters rely on headphone power to power the internal circuit boards. So if it is not working, the volume is too low or another app or iOS has grabbed the audio channel (i.e. receiving a phone call while taking a reading).
Trouble Shooting Steps
(try each individual step until resolved)
1. Turn up headset volume
2. Close the app completely (not just minimize) and reopen
3. Disable volume limiter (find in Settings>Music on all iOS devices)
4. Restart phone
5. Re-install the app