It's a lightmeter. Buy sorry I found it only compatible with IOS, no android.
The App can be set to display results as Lux or Foot-candles, depending on user preference. There is a timer function for those hard to reach spots where you can’t see the display, but you need a reading. Get the latest version of app on your Android and iOS devices using appvn store.
tread carefully with these unknown appstores.
lots of malware/adware/crapware.