I would get the Frankford DS750, cheaper than the one asked about.
I have experience with it and I am happy with it.
.02 gram may or may not register
.05 gram checkweight measured .7gr (should be .77)
.1 gram check weight measured 1.5 gr (should be 1.54)
(remember .1 gr resoultion)
.2 gram Check weight measured 3.0 gr
1 gram = 15.4 gr
Gem20
.01 gram check weight measured .16 gr (should be .154)
.02 gram check weight measured .32 gr
.05 gram check weight measured .77
.1 gram check weight measured 1.56
using these M2 check weights
http://www.amazon.com/American-Weigh-Scales-Calibration-WGHTKIT/dp/B003STEJAC
So unless I was trying to weigh really light charges I use my Frankford DS750 and am happy with it, it is what I use probably 95% of the time. (make sure it has good AA batteries)
It is $28 so you could buy it and the check weights and a GEM20 for about the same price as the Lyman. (Or it and a pound of powder if you can find any
)
I am not saying the Lyman is a bad scale I have no experience with it.
I think for $28 the DS750 is a good deal. ($28 Midway $25.72 Amazon)