What is the purpose of an eyepiece reticle?

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Tags

1. #inscribed
2. #micrometer
3. #stage
4. #called
5. #calibrate
6. #function
7. #reticle
8. #marks
9. #dimensions
10. #known
11. #distance
12. #slide
13. #lenses
14. #actual
15. #between
16. #objective