Ghostbusters 3 prop Yates grenade, Ghostbusters III prop 2016.
This is a close approximation (handmade replica) to the Yates Proton Ghost Grenade
from Ghostbusters III.
It has a working count down timer running on a 12v A23 battery.
All parts where made using a combination of tools (Dremal, 3 in 1 Mill-Drill-Lathe),
good lighting and patience.