I've been in the OD field for 10 years now and have seen the B&L Model 70 Vertometer (?) mentioned several times here as the greatest thing ever.
I like to know the "how" and "why" behind things, so what's so great about this thing, and why is it better than our Topcon LM6?
Not trying argue or start a pi$$ing war, just wanting the rationale / history behind it.
Thanks once again!
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