No, this doesn’t work on your pet goldfish. Only regular feeding and cleaning the tank out (without soap) will help there. What this will do for you however, is let you fix air conditioner condenser and evaporator coil fins easily without causing additional damage.
We’ve gotten caught out using a screwdriver for this task before. Just when you think you’ve got it right, you end up poking the screwdriver through the coil (doh!) or breaking off the fin.
Each “petal” of the tool is marked with the size it works best with, measured in fins per inch. The tool can handle 8, 9, 10, 12, 14, and 15 fins per inch and has a pretty decent looking screwdriver-style grip.
We found this particular one online for about $13, though the Froogle search below will return a number of very similar items in the same price range.