This is a simple demo of an Air Eraser from Harbor Freight. For me it's yet another solution looking for a problem.
It looks and works like an air brush (they have those, too), except you fill it with 220 grit aluminum oxide instead of paint.
It works pretty darn good, and like all good sandblasters, leaves a mess of grit all around it you don't have a blasting box (they have those, too).
HARBOR FREIGHT AIR ERASER LINK: