Captain Jack Harkness: Captain Jack Harkness, note the stripes.
Captain John Hart: Captain John Hart, note the sarcasm.
Captain Jack Harkness: Hey, I worked my way up through the ranks.
Captain John Hart: I bet the ranks were very grateful.
Captain Jack Harkness: Under normal circumstances, an exuberant Roman soldier would be my idea of a perfect morning.
Answer: Several times during the episode, most notably at the beginning when the old grave is discovered, Tosh holds a devise that looks a great deal like the Sonic Screwdriver that she uses to determine the age of the skeleton. However, a search of Google images shows that it is not the same thing.
OneHappyHusky