The 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.

Machines on display at ConExpo 2008 in LasVegas, Nevada, Nevada feature AccuGrade technology products.

For more information about the 307D, 308D CR and CR SB mini hydraulic excavators, customers should contact their local Cat® dealer or visit

The Attachments Idea Book
Landscapers use a variety of attachments for doing everything from snow removal to jobsite cleanup, and regardless of how often they are used, every landscaper has a favorite attachment.
Attachments Idea Book Cover