[Mike Taylor 3601]

I plan on buying some kind this winter looking for advice. Handheld since I have open trailer?
What brand,which version etc.?
How close does your car run to what your device predicts?
Do or can you rely completely upon what it says or use combination of several things(log book, lick your finger and hold it up in the wind, actually saw Mike Boyles do that and ''Good Ol Charlie Brown" run # he picked off the trailer)
Mike Taylor 3601