I just bought and used my first needle scaller after 25 years of business.

All I can say is wow I have been missing out.

I should have had one years ago, It gets into places that only a sand blaster can reach.

I can see where it would have come in handy for more than just chipping slag.
Dirt removal.
Peening a weld.
Rust removal.
Paint removal
Carbon removal.

What else am I forgetting: