Squeeze-type air blowers have become an essential item in an enthusiasts camera bag. Though typical blowers have one little flaw they can inhale dust and particles and may blow them onto a lens, filter, or sensor. Enter the new ProMaster Clean Air Filtered Blower. It uses a replaceable filter (blocks particles as small as 20 microns) along with some nifty internal valves to ensure ONLY clean air is taken into the body of the blower.