Sonic Tracker II
P/N 7010-0344
2-29
The Tracker has a total working range of 14 inches to 55 inches—41
inches of adjustment! This allows the Tracker to be set over a
stringline or choker on one pass, then match grade on the next pass
without moving the tracker. The Tracker is not more accurate when
set closer to the grade reference. The job application should
determine the position of the Tracker. For example, as a "rule of
thumb", when using a stringline reference, keep the Tracker about 2
feet above the string. This will give the operator about 6 inches of
lateral movement to keep the Tracker over the string. When tracking a
curb, you may want to lower the Tracker to keep it over the lip of the
curb, and avoid the Tracker from "seeing" the top or face of the curb.
Figure 2-36.
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min.
14.0"
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max.
55.0"
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