While a scale with resolution of 1 gram is good enough for most all homebrewing duties, I find that having 0.1 gram resolution is needed when dealing with water salts and acids. I've been using a triple beam Ohaus with 0.1g resolution for almost 20 years. It doesn't have a large capacity, so I bought an electronic luggage scale for grain measurement. I checked its accuracy and found it to be a half percent off (0.05 lb in 10 lbs), good enough for me.