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Most land surveying related topics are evergreen - meaning the topics of discussion are many times timeless. If you have a question regarding Land Surveying in general, this is the place to ask your questions.
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NEVER USE METAL! Your instrument will noticeably go out of level every time the sun comes in and out from clouds!
Wood Rots
Fiberglass is heavy
I have been using Dutch Hill composites since 1990....still have my original 3 (+ 3 more now) in my "personal" work truck. I can still order parts for them as they are the exact same as a brand new one. They are extremely strong, rugged, waterproof and LIGHT! Hi-quality lever locking is the only way to go. The bands are adjustable with standard hex set.
Only "improvement"/change in them in the last 20 years I know of is you can get 2 different "heads", 1 standard and an oversized one for heavier machines like older robots etc. Legs and all other parts same for both sized heads....you can tell a surveyor thought of these.
I wouldn't use anything else.......so that is what I buy the crews too. So instead of replacing a tripod/year/crew...I only have to replace a PART or 2/crew/year. and no, I'm not a salesman. It's just that if every thing I ever bought performed like these legs, I probably would be retired now............
hope it helps