Just dumping these videos here, there is some useful info in them - the title will indicate what.
Blog entry 104: Verify BDC
Blog entry 105: Wait for it
Blog entry 106: Reading mirage
Blog entry 107: THLR light steel target
Blog entry 108: Temperature stability
https://www.youtube.com/watch?v=2p5SSx1SV0A[/video]]Blog entry 109: Soft LR proficiency test
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