How can I test my phone sensor?

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Tags

1. #should
2. #corner
3. #sensor
4. #phone
5. #right
6. #which
7. #traces
8. #upper
9. #sensors
10. #related
11. #touch
12. #screen
13. #hidden
14. #tracker
15. #below
16. #button
17. #image
18. #function
19. #finger
20. #another
21. #display
22. #circled