"A smaller version of the Portable Ore Advancer that can be attached to the edges of conveyors for bonus upgrades"
The Ore Stopper is a Rare tier upgrade that is coming soon but is available in the testing server. It's a portable upgrader similar to Portable Ore Advancer and Portable Ore Enhancer and shares its upgrade tag with them. It increases ore value by 12% up to 30 times.
The Portable Ore Stopper has a shortest upgrader part out of the trio meaning you would need to have your ores on Tiny Conveyors to make sure they get upgraded. The Portable Ore Stopper has the highest multiplier of the trio making the most recommended to use (if you can afford the Tiny Conveyors and you think that the tiny conveyor setup wont clog).
- The finishing multiplier would be about x29.95, far more powerful than the Portable Ore Advancer's max at about x4.32.
- There's a glitch where an ore can get stuck if it's against the side of a conveyor.