The moisture meter can quickly measure the moisture content of the grain. 1. In the optical system there are small holes of different diameters to meet different requirements for light transmission. 2. Change the diameter of the hole with the handle. 3. Metallic material, reliable performance, durable. 4. 5. The compact and practical design makes the membrane work more stable. . MECHANICAL OPTICAL IRIS SHUTTER SK23 Specification: Item Type: Iris Membrane SK25: Enlarged diameter: 1,5-25 mm Material: metal Outside diameter: 44mm Inner diameter: 25mm Thickness: 8 mm 14 blades SK23 Outside Diameter: 37mm Minimum hole diameter: ø1,5 mm Maximum hole diameter: ø23mm Material: metal Thickness: 7,0 mm 12 blades SK12 Outside diameter: 19.8mm Minimum aperture: ø1mm Maximum opening: ø12mm Material: metal Thickness: 5,0 mm 10 blades SK8 Outside diameter: 14,8 mm Minimum aperture: ø0,8 mm Maximum opening: ø8mm Material: metal Thickness: 4,5 mm 8 blades SK6 Outside diameter: 13,0 mm Minimum aperture: ø0,8 mm Maximum opening: ø6mm Material: metal Thickness: 6mm 8 blades . MECHANICAL OPTICAL IRIS SHUTTER SK23 List of packages: 1 x Membrane . MECHANICAL OPTICAL IRIS SHUTTER SK23