The GDF312 (and the GDF311) Professional 3000 series tribrachs are the mid-grade professional tribrachs from Leica.
All Leica original tribrachs comply with the strict specifications and quality standards of Leica Geosystems. Your choice should ideally be made according to your individual accuracy requirements.

These tribrachs are suitable for non-motorised TPS instruments with angle accuracy from 5" to 7" and GNSS antenna stations as well as backsights and control points.
The torsional rigidity (or hysteresis) of the Professional 3000 Series tribrachs amounts to a maximum of 3" (1.0mgon).

The accuracy with which a tribrach returns to its starting position once the instrument has stopped, is called torsional rigidity or hysteresis. This hysteresis is the relative movement between the top plate and the base plate of a tribrach that occurs through the rotation of a TPS instrument. The hysteresis has direct influence on the angular accuracy of the instrument – and that speaks for the original. To optimize the hysteresis as Leica Geosystems has done is complex and calls for the highest precision: a movement of the top plate to the base plate of 0.3µm corresponds to an angle error of 1". Especially motorized instruments with their high acceleration and brake power require tribrachs with very high torsional rigidity.
The foot screws are maintenance free and have a larger diameter. This allows for fine adjustments, even when wearing work gloves under difficult environmental conditions.

The GDF321 (and the GDF322) Professional 5000 series tribrachs are the highest grade professional tribrachs from Leica.
Individually tested. Suitable for all high-angular accuracy requirements. The torsional rigidity (or hysteresis) of the Professional 5000 Series tribrachs amounts to a maximum of 1" (0.3mgon).
All Leica original tribrachs comply with the strict specifications and quality standards of Leica Geosystems. Your choice should ideally be made according to your individual accuracy requirements.

The tribrachs in the 5000 series are recommended for all tasks that require angle measurements of 3" or better.
Due to the minimal torsional rigidity (or hysteresis), we recommend use of the Professional 5000 Series for all motorized instruments.

The accuracy with which a tribrach returns to its starting position once the instrument has stopped, is called torsional rigidity or hysteresis. This hysteresis is the relative movement between the top plate and the base plate of a tribrach that occurs through the rotation of a TPS instrument. The hysteresis has direct influence on the angular accuracy of the instrument – and that speaks for the original. To optimize the hysteresis as Leica Geosystems has done is complex and calls for the highest precision: a movement of the top plate to the base plate of 0.3µm corresponds to an angle error of 1". Especially motorized instruments with their high acceleration and brake power require tribrachs with very high torsional rigidity.
The foot screws are maintenance free and have a larger diameter. This allows for fine adjustments, even when wearing work gloves under difficult environmental conditions.

Leica GHT66 bracket for attaching a CS20 field controller with a GHT63 clamp to a pole. GHT63 clamp is not included.

Leica GHT63 replaces GHT52. GHT63 pole clamp allows for the attachment of the GHT39, GHT56, GHT62, and GHT78 cradles to all poles 1.25" in diameter and under. GHT63 also allows for the attachment of CS10, CS15, Zeno 10/15, CS20, and CS35 Handheld Field Controllers.

The Leica GLS13 telescopic aluminium GPS rover rod with 5/8" thread mount snap locks at 1.80m and 2.00m. Rubberized grip is comfortable in the hand. Includes circular bubble.

Min. length, 1.39m. Weight 2 lbs. (950g)

The Leica GLS30 Telescopic Carbon Fiber GPS Rover Rod snap locks at 1.8m and 2.0m for rapid setup. Bubble vial and 5/8" thread mount.

Lightweight, the GLS30 weighs only 1.55 lbs.

The Leica GZS4-1 GNSS height hook is Leica's patented vertical measurement device used for measuring the height of GPS antenna.
Hook for positioning a tape measure directly below the tribrach. Connects to all Leica Geosystems carriers. To precisely measure the height of GNSS antennas and reflectors. With integrated tape measure graduated in mm and inches.

Leica GRT146 tribrach adapter with 5/8" screw is ideal for GPS antenna, prisms, and target plates. Used with tribrachs with optical plummet. For direct fitting of GNSS antennas

The GDF322 and the GDF321 Professional 5000 series tribrachs are the highest grade professional tribrachs from Leica.
Individually tested. Suitable for all high-angular accuracy requirements. The torsional rigidity (or hysteresis) of the Professional 5000 Series tribrachs amounts to a maximum of 1" (0.3mgon).
All Leica original tribrachs comply with the strict specifications and quality standards of Leica Geosystems. Your choice should ideally be made according to your individual accuracy requirements.

The tribrachs in the 5000 series are recommended for all tasks that require angle measurements of 3" or better.
Due to the minimal torsional rigidity (or hysteresis), we recommend use of the Professional 5000 Series for all motorized instruments.

The accuracy with which a tribrach returns to its starting position once the instrument has stopped, is called torsional rigidity or hysteresis. This hysteresis is the relative movement between the top plate and the base plate of a tribrach that occurs through the rotation of a TPS instrument. The hysteresis has direct influence on the angular accuracy of the instrument – and that speaks for the original. To optimize the hysteresis as Leica Geosystems has done is complex and calls for the highest precision: a movement of the top plate to the base plate of 0.3µm corresponds to an angle error of 1". Especially motorized instruments with their high acceleration and brake power require tribrachs with very high torsional rigidity.
The foot screws are maintenance free and have a larger diameter. This allows for fine adjustments, even when wearing work gloves under difficult environmental conditions.