For the highest level of accuracy, you need the Brewmaster Precision Digital Scale. Most scales only measure down to 1/10th of a gram or 0.1 while this unit measures to the 1/100th of a gram or 0.01. This is the ideal scale for measuring brewing salts when you want your water profile to be as on point as possible. Also works well for hops, additives, or other measurements under 1 lb.
If you're not concerned about having this level or precision, or want a scale that also works well with measuring specialty grains, check out the Brewmaster Mini Digital Scale.