Omni’s plum bobs are built out of solid brass and are manufactured to be perfectly balanced. The 18oz plum bob can be used to set surveying instrument exactly over a marker in a straight line. The plum bob can also help calibrate your surveying rods and make sure they are exactly straight.
• Replaceable steel point
• Plumb bob point storage
• Standard threads for cap and point
• Weight 18oz (510g)