Operating the Prism 6T couldnt be easier - simply turn it on, select the preferred search mode,
adjust the desired level of discrimination and sensitivity, sweep the coil across the ground to
set the ground balance for conditions present (or bob the coil up and down a few times), and
start searching for a good target.
Another useful feature is the short-term memory which retains all the settings (except for the
ground balance setting), making it simple to move from site to site and not having to readjust
things that you have tweaked based on personal preferences.
The 6Ts eight AA batteries should provide 25 hours of operation. Whites recommends
alkaline cells for optimum performance, however rechargeable batteries will work with just a
slight reduction in usable life.
The 6T features a battery monitoring system which checks battery strength when the unit is
turned on. Good batteries will produce a high-pitched tone, while batteries nearing the end of
their life produce a low tone. When they are almost exhausted, a LOW BATT icon appears on
the screen along with a distinctive 3-beep alarm.
Field Test
With a number of good sites nearby to test detectors, I loaded the Prism and my gear into the
truck and headed over to a few private yards I had searched before, certain there were still
more keepers to find. Rejecting the first two target groups (iron), I was off hunting in under a
minute after unpacking the 6T.
Based on the falsing the clay produced, I opted to drop the sensitivity to 5 which immediately
settled things down considerably.
The first few signals produced clad coins at depths from 2 to 4 and each produced a consistent
VDI indication that allowed me to accurately identify the targets before recovering them.
In the front yard of one home, I received a repeatable VDI reading of +75 accompanied by the
arrow pointing to 1c/10c and an indicated depth of 6. Hopeful, I removed a deep plug and saw
the glint of silver near the bottom of the plug. Pulling it free, I could read the date 1902 on a
nice Barber dime.
Near the house itself, the amount of trash in the ground from past construction increased
significantly.
With the low level of discrimination I was using, I could hear most of the targets and it
quickly became apparent the 6T had a fairly short recovery time, which is needed when
hunting trashy sites. This keeps a trash target from masking a good one when the two are very
close to one another.
Slowing my sweep speed down to ensure I did not miss anything, I pulled out five Wheat
cents, another silver dime (1944) and a metal cereal box premium, while only recovering a
minimal amount of trash through the use of the target ID capabilities audio and visual - of the
6T. A smaller coil would be a perfect addition for hunting these types of sites and word is that
Whites is working on just such a coil for release in the near future.
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