Designed in 1984 by Egon Spengler and Ray Stantz, the Proton Pack counters the negative energy which ghosts are made of with a Proton Stream, a stream of positively charged ions which can harness a ghost. The Proton Stream is very dangerous and barely controllable. Egon has also mentioned that crossing Proton Streams will result in total protonic reversal causing all life as we know it to stop instantaneously and every molecule in a user's body to explode at the speed of light.
Powers and Stats
Tier: At least 9-B at lower settings, Unknown at higher settings | At least 6-A, probably 5-B, possibly higher
Name: Proton Pack
Classification: Portable Particle Accelerator, Anti-Ghost Device
Prerequisite for Use: Training on how to use it
In use by: The Ghostbusters
Powered by: A small nuclear reactor
Powers and Abilities: Able to launch supercharged particle beams capable of damaging and restraining ghosts and otherwise intangible entities
Attack Potency: At least Wall level at lower settings (Can easily blow apart walls and heavily damage rooms), Unknown on higher settings (On higher settings, the particle beams have shown to cause some degree of harm to beings on the level of the Stay Puft Marshmallow Man and Vigo the Carpathian) | At least Continent level (Had the potential to destroy the entire state of New York in a process Egon described as "all life as you know it stopping instantaneously and every molecule in your body exploding at the speed of light".), likely Planet level (In Ghostbusters: Deviations, the Ghostbusters refuse to cross the streams due to the fact it could destroy the entire world), possibly higher (Destroyed Ivo Shandor, who controlled the entire ghost world and had become comparable to a very powerful manifestation of Gozer, though this was done by crossing five streams instead of four, meaning the power was likely significantly greater)
Speed: Relativistic+ (The particle beams fired by the packs move at speeds)
Weaknesses: There is an extremely high chance that crossing the streams will have absolutely catastrophic effects on the user, their surroundings, and the planet itself.
Key: A single Proton Pack | Four Proton Packs crossing the streams