I have not seen a digital scale that reads any more than 1/10 (0.1) grain. Even then, you do not know whether it is just over or below the indicated weight. My 30yo 505 scale does the same thing, but the indicator gives you an indication of whether it is high or low.
I do like the RCBS scale that dispenses the exact amount of powder, but never bought one....prolly $400 by now.
Rcbs 505 or the Oahus is a good choice. Some of the digital scales are ok at best but they dont work with power and the batteries are always dead. One of the reasons I will never own a digital caliper.