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Topcon 9142 sonic tracker for paver, profiler, or motor grader machine control. Works with System Five and System Four and is SAS compatible.
High-resolution sonics for application versatility. Use references such as: elevated stringline, surface string, poured curbs, or existing surface
Rugged cast housing with completely sealed internal electronics
Easy to attach and position over reference
Bright grade indication LED's display continuous grade information
 
(S/N's may be different from the picture as there are multiple available)