@john-nolton, Iƒ??ve never used a DKM3 before (I have a Wild T1A that I use). ?ÿIƒ??m interested in trying it for tacheometry, but Iƒ??m even more int...

I sort of figured the T1A might be more accurate than a non-steel tape, and I don't have access to a steel tape, so the NGS base line and/or control p...