Compare between Bar -cod Staff 5/4 Section & regular 5/5 in English

This video is about Survey Staff, how we can read survey Regular & Bar cod Staff in English. Regular staff use same section with length lime 5 meter staff = 5 sections and 4 meters staff = 4 sections but in bar cod staff we use 4 sections in 5 meters length (4/5) and also regular staff after complete 1 meter use 1 and 2 meters complete use 2 number but in bar cod staff only use dots 1 meter 1 dot 2 meters 2 dots and 3 meter 3 dots 4 meters 4 dots

Terms using & Computation in Survey Leveling Works in English

in this video, I explain what we use terms in Level Surveying & how to computation in Level Surveying. like
BS (Back Sight) IS ( Intermediate Foresight) FS (Fore Sight) HI ( Height of Instrument
HI= BS+ELEVATION
ELEVATION = HI-FS(IS)