The Engineer set (made up of the Pressure Gauge and the Monkey Wrench) is a set of travel items in 80 Days.

The Monkey Wrench's off-label use as a weapon is well-known; Fogg may speak of Passepartout's possession of the wrench in the same fashion he might when discussing a Smith and Wesson revolver or the like, and it proves to be the weapon of choice for the perpetrator of the murder of Shu and subsequent frame-up attempt upon Passepartout. Passepartout himself will deploy it with especial effectiveness as a personal-defense weapon should the pirates on the ship from Muscat to Karachi attack him.

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