Miracle Day: The Blood Line - S4-E10
Continuity mistake: At the very end of the episode, when Rex is checking his phone, when the camera is facing him, his phone is being held in portrait, but when the camera is over his shoulder, looking at the screen, the phone is in landscape. This is shown twice, when the camera shots switch. (00:53:35)
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