Iris Diaphragm Valve With Size 3 inch to 15 inch is to gently control the discharge of free flowing powders, granules, and pellets Including chemicals, food and dairy products, pharmaceuticals, minerals, and plastics in gravity-flow applications. An iris diaphragm is an adjustable assembly of thin metal leaves for varying the size of openings that determine the cross section of the light ray bundle entering the condenser and the objectives. Light Source - usually located in the base of the microscope. The iris diaphram is an adjustable shutter which allows you to adjust the amount of light passing through the condenser. The angle determines the Numerical Aperture (NA) of the condenser. This diaphragm, generally called the aperture diaphragm, is one of the most important controls on the microscope.

• High durability