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I recommended this to a customer. After he used it, he eMailed me,
“That’s the best DCC tester I’ve ever seen.” So, I had to share it with
my readers.
It doesn’t come from a hobby store.
Look at your auto parts store
or online for an “automotive
12 volt tester”. The one my
customer bought was about
$3 from Harbor Freight, as
shown in the photo. I’ve even
found them at “dollar” stores.
They are the cat’s pajamas
for sorting out dead frogs and
track wiring errors. Clip to one
track and probe the opposite
track for power.
Checking out power district or auto-reverse section wiring? Just
clip to one rail at the district boundary and probe the two rails on
the other side of the boundary. It will light when you have opposite
polarity between the two sections.
Want a quick check of a function output on a decoder? Clip this
between the blue lead and the white (or whatever function you are
testing) lead. 
From Mr. DCC’s workbench
– The best DCC tester
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DCC Impulses Column - 9
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MRH-Mar 2013