The built-in meter is broken or requires special batteries?
Use Luxilux in aperture priority mode (Av) by choosing the ISO and aperture, and Luxilux will calculate the right shutter speed to get a proper exposure.
Use it in shutter priority mode (Tv) by choosing the ISO and the shutter speed, and Luxilux will calculate the right aperture to get a proper exposure.
Manual mode (M) lets you change all values and shows you how much they differ from the calculated optimal exposure.
You can choose between full stops, half stops or third stops for ISO, aperture and shutter speed.
Specify the area for the meter reading even more accurately by zooming in or out.
If your device has two or three back cameras, you can switch between them.