assigned to inspect every student entering the castle with Secrecy Sensors. All the owls flying into Hogwarts are also placed under this measure to ensure that no Dark object enters the castle through mail. Hermione later explains that although Secrecy Sensors detect jinxes, curses, and Concealment Charms, they cannot detect love potions, as they are not considered Dark. Sneakoscope A Sneakoscope serves as a Dark Arts detector. The device is described as a miniature glass spinning-top that emits shrill noises in the presence of deception, for instance, when an untrustworthy person is near or when a deceitful event takes place nearby. Sneakoscopes are introduced in Prisoner of Azkaban when Harry receives a pocket-sized version from Ron for his 13th birthday. Bill says that Pocket Sneakoscopes are unreliable, as it lit up and spun at dinner for apparently no reason, but Fred and George had put beetles in his soup without his knowledge. The sneakoscope appears again on the Hogwarts Express, and again in Harry and Ron's dormitory. Harry later discovers that Scabbers, Ron's rat, who is present each time the Sneakoscope is spinning, is actually Peter Pettigrew in Animagus form. In Goblet of Fire, Alastor Moody has several sneakoscopes that he somehow disabled, claiming, "It wouldn't stop whistling", keeping them in one of the seven compartments of his magical trunk. The sneakoscopes' constant alerts in his presence were because he was Barty Crouch Jr. using Polyjuice Potion. In Deathly Hallows, Hermione gives Harry a Sneakoscope for his seventeenth birthday which they later use as a lookout while in hiding. Weasley family clock The Weasleys have a special clock in their home, the Burrow, with nine hands, one for every member of the family. Instead of telling the time, the clock reveals the location or status of each family member. The known locations are: Home, School, Work, Travelling, Lost, Hospital, Prison, and Mortal Peril. The Weasleys are the only family mentioned in the series to own such a clock. Dumbledore calls the clock "excellent" and seems impressed by it. The location Mortal Peril is situated where the numeral 12 would normally be. Throughout the first five books, the hands change to reflect the varying statuses of the family members, but by the sixth book all nine hands point to mortal peril at all times, except when someone is travelling. Mrs. Weasley takes this to mean that with Voldemort's return, everyone is