Surveyor's tribrach, a specialized leveling base used to mount instruments like total stations or GNSS receivers onto a tripod.
Function: It allows for precise leveling and centering of surveying equipment over a specific ground point.
Features: It typically includes three leveling foot screws, a circular bubble vial for leveling, and a locking mechanism for securely holding an instrument base adapter.
Variations: Models may come without an optical plummet (as pictured), requiring a separate plumb bob or laser plummet for centering, or with a built-in optical/laser plummet.
Material: Usually constructed from durable aluminum or other sturdy metals to ensure stability during measurements.