When it came to The Real Ghostbusters toy weapons and tying them into Ghostbusters II their was only one you could say is directly from the movie. That’s the Ecto-Charger.
The Ghost Grab-A-Meter on the other hand while not exactly based on equipment from Ghostbusters II reminds me of a Slime Scoop merged with a Giga Meter.
When Kenner came up with the Ghost Grab-A-Meter they opted to make it more interesting then just another claw toy that can grab an object. With only one The Real Ghostbusters weapon/action toy to go, Kenner was all in. That’s because the Ghost Grab-A-Meter is also a missile launcher!
I’ve taken the original 4 page Ghost Grab-A-Meter Instructions, scanned them, and made them into 3 PNG files. I’ve also scanned and included the decal sheet.