Hammer unit
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| “ | We only got two speeds: fast and faster!
Click to listen
— 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 the Demoman (which both use the Base Jumper's parachute) are reliant upon Hammer Units for calculation.
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