- Remove dust, swarf or moisture.
- Chill an item to make it contract.
- The best ones worked inverted.
- Buy ones with an attachable tube.
- Buy CFC free.
- Always wear "eye-protection"/].
These groovy little gizmos are cans of compressed air you can use to clean dust, metal shavings etc away without having to put your face in close proximity. They also have a significant cooling effect similar (but not as intense as) the freeze sprays mentioned elsewhere.