A1BR30 Break-Off Survey Monument
The first magnetic break-off monument introduced by Berntsen - Designed to be used in areas where surface disturbance is likely
- Elongated base is designed to break at a predetermined point
- Magnetic remnant is left at the original location after impact, even if the entire pipe & cap portion of the monument is pulled from the ground
- Prevents complete loss of the original survey point
- 3¼" (83mm) diameter 6000 series aluminum survey cap*
- 2" (50mm) diameter ID aluminum pipe
- Cast aluminum break-off base *
- Cap and base are held to the pipe with aluminum rivets
* Permanent ceramic magnets located in the cap and below the break-off point in the base
A1BR30 Survey Monument Installation Instructions 
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Preview
A = 3 1/4" (83 mm)
B = 2 3/8" (60 mm)
C = 30" (762 mm)
D = 5 1/2" (140 mm)
E = 4 3/8" (111 mm)
F = 33 1/2" (851 mm)