The best way to be sure that your pork chops are done is to use a meat thermometer, which should register 145˚F when inserted into the pork chop, not touching the bone. If the chops are thin, though, it can be hard (or even impossible) to insert the meat thermometer enough to get a reading.  In that case, look for three things: the chops should be firm and springy to the touch, not soft or mushy; if you cut into the chop, the meat should be white, or have the faintest tinge of pink - no dark pink or medium pink; and the juices of the pork chop should run clear.