The calibration check may not pass under certain conditions:
- There is too much noise in the room. For example, when there is traffic noise, vibrations from people walking around, etc. The calibration check must be done in a quiet room and the device placed on a soft surface. For example, do not put it on a table. Use a soft pad or pillow if you are running into bad calibration.
- The earphone nozzle may not have been properly inserted into the calibration cavity. Please insert the nozzle fully into the calibration cavity.