Master's Surveillance Scanner

A portable visual monitoring device the Master uses to track the Doctor and Turlough from the shadows of his TARDIS. Its glowing interface casts eerie reflections against the console as the Master observes the unfolding catastrophe on Sarn, where volcanic tremors intensify and fanatical cultists close in. The scanner's narrow viewing angle and precise targeting suggest it operates like a temporal tachyon sensor, capable of piercing the Doctor's attempts to cloak his movements.