Download Smart Screen Off PRO v2.3.2 APK. (Light sensor combo works great with recent smartphones like Galaxy Nexus; Light sensor combo could not work good with old smartphone, because the built in sensor is of poor quality). If you use TIMER DELAY + LIGHT SENSOR: Timer delay will start every times the proximity sensor is covered, but it will turn off screen only when is reached the "minimum + sensitivity" of light condition you set in the settings.
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