Grenade launcher timer

Saxon looked up, finding the drone as it came hunting once more.
He pulled the G-87 to his shoulder, almost aiming straight up, and squeezed
the trigger. With a hollow grunt, the weapon discharged a shell in
an upward arc. The dial set the grenade fuse for a half second, but even as
the drone passed over him, Saxon knew he had misjudged the shot.
The shell exploded and the robot flyer bucked from the near hit, but
maintained its dive.

- Deus Ex: Icarus Effect, Chapter 2 pg. 46