Bi-directional Tribrach
I have been looking a tribrachs recently and just wanted to reach out to see if any one has used a bi-directional plummet tribrach? Is adjusting them done differently? Are they more susceptible to being knocked off plum? Is trimble the only one that manufacturers them? Also what tribrach models do you suggest for the following:
1. GNSS
2. Backsights
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