Getting the correct pressure in your tires normally takes a few rounds of swapping between chuck, pressure gauge, and sometimes the pin on the back of the gauge to let out air because you added too much. With an all-in-one inflator like this tool from Campbell Hausfeld, just clip the chuck on the stem and read the tire pressure — then squeeze the trigger to start adding air, or release some pressure with the relief valve.
Campbell Hausfeld mounts the chuck on a length of air hose to make it easy to reach awkwardly placed stems. The pressure gauge reads between 10 and 100 PSI, which should be adequate for most home applications.
This model retails for $28, but you can find it for less than $20 if you look around.