Schonstedt SPOT, Instruction Manual

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Along the fence, perform the search by slowly moving the locator forward while also moving it to
the right and to the left. As you move forward, this technique will allow you to search an area
that is several feet wide. Listen for an abrupt drop in the signal (as shown by the null in Figure
15) that will occur when the lower sensor, located 1-5/8 inches from the end of the locator, is
directly over the stake. Any variation in the position of the locator will produce an abrupt rise in
the frequency of the signal.
Figure 15: Placement of Locator While Searching Along a Chain Link Fence
Locating Valve Boxes
Both the valve and its casing, when iron, provide strong magnetic fields that make them easy
to locate. Plastic enclosures containing magnets (which are typically used with non-ferrous
valve boxes) are easily located at depths of up to 10 feet.
Figure 16: Locating Valve Boxes and Casings