Kuhnhausen says to use the weights below a 5# pull, because below that weight, the digital scales can be manipulated to read whatever you want them to read by changing how you pull them.
Let me 2nd the Lyman comment. Really really repeatable and very nice. The problem though is the 12 lb limit. Lots of DA revolvers from the factory exceed this though.
For anything above 12#, I use a Rapala digital fish scale, goes up to 50#, also very repeatable. Good for weighing guns, and I also use it for determining weights of all those "extra" 1911 recoils springs lying around..............
The reference in Kuhnhausen is volume 2, page 171, note 5, "Trigger pull checking note:"
"Pulls of 5 lbs. and higher can be optionally checked using a Brownell's recording trigger pull gauge or a std. ordnance/NRA weight type measuring system. Pulls of 4-1/2 lbs. or less should be checked with an ordnance or NRA type trigger pull weight system, only."
For a thirty cent increase, I'll go with Kuhnhausen.
I really prefer the NRA dead weights. I find them to be the most consistent and there really isn't a whole lot that can go wrong with them. I don't think they're the cheapest option, just the best IMHO.
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