Stargate SG-1 (1997)
1 question in Window of Opportunity
Revelations - S5-E22
Revealing mistake: Just before Teal'c and O'Neill get to the engine room door, Carter can be seen hiding around the corner. (00:27:40)
More quotes from Stargate SG-1
Trivia: Dom DeLuise and his three sons Peter DeLuise (who has written, directed and produced a number of episodes), Michael DeLuise and David DeLuise have all appeared on the show at least once. Peter DeLuise has appeared many times.
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Answer: It's a pen torch or pen light. Used to test pupil dilation response.