Use APKPure App
Get OKO Light Meter old version APK for Android
Use your phone as an incident light meter, great for shooting film.
Use your phone's built in light meter to determine the correct exposure.
New feature: Lock the measured value with the volume down key on your device and unlock with volume up!
App supports setting the ISO value and measuring for shutter speed or aperture. Device sensors are usually not accurate enough for low light situations, that's when you can use the descriptive presets to determine the amount of light.