^^^ Don't know about the craftsman digital, but I have 5 stand-alone gauges in the garaged. Every time I bring home a new gauge, I check it compared to what I have. If it doesn't read about the same as others, I don't use it. Its like culling the bad and keep the good. I have 4 analog (needle) and 1 digital that all look like they read the same. I also have one on the compressor air chuck (analog needle) but it reads about 5 psi low compared to my other gauges in the range of checking tire pressures.
Its like buying a thermometer, I'll check several. Every once in awhile I'll run across one in the bunch that doesn't read like the others, so I'll pick one that reads like the majority. Kind of a risk/chance when it comes to buying a tire gauge I guess.
Higher quality gauges probably have a tighter manufacturing specification, just hope the quality control is on top of things too. I just don't know much about the digital. I don't know what make my digital is, but I know its not craftsman.