38. Herbinius Prewett’s Stunning Stealthy Sneak-O-Scope [c.1835]
Created by Molly Weasley’s great-great-great-uncle Herbinius Prewett, the Sneak-O-Scope was invented to eavesdrop on conversations. One simply places the dial-shaped piece on the door or wall to listen in. Prewett sold this object to the Muggle medical world in the early 19th century. Its unique super-sharp hearing abilities are used to assess heart health.