The brightness (illuminance) of the ambient light is measured in lux (lx) units, and the synthetic voice continues to be read aloud.
You can also adjust the reading interval.
It will not work unless the TTS engine is installed on the smartphone.
Depending on the model and TTS engine, it may take a few seconds for the start button to take effect.
It cannot be used on smartphones that do not have an illuminance sensor.
Depending on the model, the number after the decimal point may remain 0 or be fixed to one other number.
Also called an Exposure meter or Photometer.