Hammer unit
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| “ | We only got two speeds: fast and faster!
— The Engineer measuring projectiles' HUs
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Hammer units, often abbreviated HUs, are the unit of measurement used by Source Engine games. It is also used to judge the speed of objects and players in-game, mostly for competitive play. 1 Hammer unit is 1.905 cm, and is the minimum distance the Source Engine can measure.
Some weapons, such as the Sandman's former long-time mechanic of stunning players, relied upon Hammer Units for the minimum distance needed to activate its effect.
A number of Achievements, such as "Project Excelsior" for the Soldier and "Operation High Dive" for theDemoman (which both use the Base Jumper's parachute) are reliant upon Hammer Units for calculation.
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