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The Caterpillar ST400C weatherproof Sonic Tracer is an ultrasonic sensor with an integrated grade display unit. The ST400C is used to reference string line, curb, and gutter, or previous pass as a grade control reference. The ST400C is environmentally sealed and designed for use in harch environments, exceeding industry standards for vibration, temperature, and electrical protection. Used as a part of an automatic grade control system, the ST400C features selectable on-grade accuracy to allow configuration of the ST400C to match the job site tolerances. An industry standard CAN (ISO J939) interface makes system integration a snap. The Sonic Tracer is currently featured on M-Series & H motor graders.