This tool is probably well known to most, but I just discovered it. So I thought I would share.
When working with a pin vice under the dissecting scope, I'm always having to lean down and blow away dust. These little non-aerosol dust blowers are available on-line for between $5 & $10. I prefer the one with a brass tip and one-way valve (it takes air from one end and blows from the other). Search online as "dust blower" or "dust blower bulb".
FWIW...