You just need put the light sensor on your phone towards the light source, and press the "Measue" button, we can caculate the Lux(Luminance), EV(Exposure value) and show you the exposure settings
The accuracy of measurement depends on the sensor of your device
The permission for Internet Access is for anonymous usage tracking, you can disable it in settings page
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Add option to control layout rotation
Format aperture and shutter values
Add rate me option into menu
Support record the max LUX value during each measurment