Needle scaler

From GAWDAwiki

A needle scaler is an air tool that uses compressed air to force a piston backwards and forwards. The piston is connected to a number of very fine chisels resembling needles. The needles move back and forth up to approximately 5,000 times per second, rapidly chipping away debris.^[1]

References

1. http://ezinearticles.com/?Needle-Scaler-and-Debris-Removal&id=957262