Wasn't clear if OP was considering a standalone for accuracy's sake or convenience. If query was about out of convenience to determine if any air needs to be added, then I would say no, not worth it. If my tires have been sitting unused for even 24 hours, I attach the pump with the presumption that some (even a little) amount of air has been lost.

From accuracy standpoint, I also assume that my floor pump, if it is a bit off from 100% accuracy, is consistently off. I've now determined the pressure that works best according to my pump, so I inflate to that.