Filter, 47mm, 0.4µm, Polycarbonate, Plain White, 1 Back Catalog number: GFPC447 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended GFPC825 Filter, 25mm, 0.8µm, Polycarbonate, Plain White, 1 Price on request 360-0162-01 Go-Cal Manual Price on request 783-0013-01-R Battery Pack AA Alkaline Price on request