Trimble ST400 Sonic Tracer For GCS900

Trimble ST400

Trimble ST400 Sonic Tracer

The TrimbleĀ® ST400 Sonic Tracer uses ultra sonic signals to maintain a set distance or elevation from an object, a design surface, or the ground.


When mounted to a motor grader or dozer blade, the ST400 Tracer can be used to reference a string line, curb and gutter, or previous pass as a grade control reference.

The Trimble ST400 Sonic Tracer offers heavy and highway contractors:

  • Multicolored integrated grade display – conveys clear grade feedback to the machine operator for higher productivity
  • Selectable sensor accuracy – provides typical accuracy of +/- 1mm (0.04″) to control elevation for even the tightest jobsite specifications

Trimble ST400 Grade Control

The ST400 Sonic Tracer can be used in single or dual configuration and is compatible with GCS900 Grade Control Systems.

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Trimble ST400 Spec Sheet