White’s Electronics M6 - Manual (Page 11)

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2. Blocks - A series of 16 blocks appear along the
bottom portion of the display and line up with the
indications on the reference label below the display.
It is important to note these blocks are from a
separate source than the VDI number and separate
sound provides a second opinion. A full block
indicates the M6 has complete information for
target identification. A half block indicates the M6
has partial information. A quarter block indicates
the M6 has only a small amount of target informa-
tion.
3. Labels - The most common metal target (or
targets in some cases) within a particular Block is
listed on the display and referenced on the label
below the display. If two targets are listed, the first
to be listed is the most common, the second is less
common than the first.
4. Depth Indication - Trigger (on hand grip)
squeezed and held, the display indicates the depth
of coin sized metals. Starting at 12 inches and
indicating in descending order (as the target gets
closer to the bottom of the search coil) the indicator
provides an aid in better locating the target in the
ground (how deep you will need to dig) and
whether the metal target is likely worth digging.
Only the heavier more valued targets get deeper
into undisturbed ground. Foil will not sink deeply
into undisturbed ground. Targets that indicate depth
readings from 3-5 inches are not as predictable.
5. PP Blocks - Trigger (on the hand grip) squeezed
and held, the PP blocks aid in pinpointing the exact
center of the metal target. When the search coil is
directly over the center of the metal target (longest
possible length PP Blocks) the depth reading is
giving you the most accurate depth indication. With
some experience the relative size and shape of the
metal target can be recognized during pinpointing.
Chapter 4 M6 Display Half block indicates target I.D. is not certain.
Note: In this case, the 1¢ is the probable ID.
NOTE: Please refer to page 18 for the proper "X"ing
technique to "Pinpoint the exact center of the target.