Seco surveying traverse/backsight kit available from Associated Instrumentation Pty Ltd. Included is a tribrach, rotating optical plummet/adaptor, 62mm prism with target, and carry case.
The prism canister is silver coated to resist fogging and the prism has <5 arc-seconds angle deviation. The adjustable tilt target has 0, -30, and -40 prism offsets and is reversible; orange/white and black/white. The target also has a sighting collimator for precise pointing.
The rotating optical plummet/adapter is compatible with all prisms with a 24.9 mm bayonet base. It has a 2.5X twist focus optical plummet and a 60-second adjustable plate vial. The adapter has a precision machined axis that rotates 360 degrees. The height is 100 to 120 mm and over the point accuracy is 0.5 mm at 1.5 m.
The tribrach features an 8-minute circular vial, and 5/8 x 11 base thread.