From Reddit's gynoceros
"FYI- if you attempt to fly with a Giottos Rocket Blower (you know, rubber bulb you squeeze to force air down a nozzle to blow dust off your sensor- no metal, no moving parts), TSA may confiscate it because it "looks like a bomb", no questions asked."
Gynoceros' Giottos Rocket Air Blower
was confiscated by Newark's TSA. I'm feeling safer already.
The good news is that I made it through Orlando, FL and Washington/Dulles TSA with my blower, so this may be a regional issue. (thanks Chris)