Probity Probe

• Type: Magical Device, Security
• Owners: Ministry of Magic, Gringotts Wizarding Bank
• Maker: Unknown

A Probity Probe is a security instrument described in the novel as a “long, thin golden rod.” It is a handheld device used by security personnel to detect concealed magical items and spells.

The primary function of a Probity Probe is to detect Dark Magic, powerful enchantments, and magically hidden objects. It serves as a high-level security measure, similar to a Muggle metal detector but for magic. To use the probe, a guard or official slowly passes the rod over a person's body and their belongings. If the probe detects an item of significance or a powerful concealment charm, it reacts. When used to scan Hermione Granger's magically extended beaded bag, which contained the Sword of Gryffindor, the probe began to “vibrate,” alerting the goblin guards to the presence of a potent magical object hidden by a strong Concealment Charm. This indicates that its detection capabilities are sophisticated enough to sense magic even through powerful counter-enchantments.

The specific history and origin of the Probity Probe are not detailed. They were notably implemented at Gringotts Wizarding Bank as part of heightened security measures following Lord Voldemort's takeover of the Ministry of Magic during the Second Wizarding War. This suggests they were either created or more widely distributed by the new regime to enforce control and prevent subversive activities.

The Probity Probe appears in Harry Potter and the Deathly Hallows during the trio's infiltration of Gringotts. As Harry Potter (disguised as Dragomir Despard), Ron Weasley (disguised as a foreign wizard), and Hermione Granger (disguised as Bellatrix Lestrange) attempt to enter the bank to retrieve Hufflepuff's Cup, they are stopped for a security screening. A goblin uses a Probity Probe on the trio, and it immediately detects the Sword of Gryffindor hidden in Hermione's bag. This moment creates a critical point of tension, as their mission is nearly compromised at the first hurdle. To prevent the guards from confiscating the sword and discovering their true identities, Harry Potter is forced to place both the goblin, Bogrod, and a human wizard guard under the Imperius Curse. This act, one of Harry's rare uses of an Unforgivable Curse, highlights the moral compromises he must make in the war against Voldemort. The probe thus serves as a catalyst for a significant character moment and a key obstacle in the Gringotts heist.

• The Probity Probe as a distinct golden rod does not appear in the film adaptation, Part 2. While the trio undergoes a security check by the goblins at Gringotts, the specific device from the novel is not shown (film).