Porton Grid

The circle area of the porton reticle increase with root 2 progression as do the dividings on the right hand side of the rectangle. These dividings are numbered for convenience. The specimen is racked on the mechanical stage of the microscope and traverses are taken right across the deposit sizing all the particles encountered.

Micrometer scales, grids, circles and selected designs are suitable for use in the eyepieces of all microscopes for measurement, gauging, counting, comparison and absolute size determination. Three standard reticle diameters are available: 19mm, 21mm and 24mm. The desired diameter can be determined by accurately measuring the internal diameter of the eyepiece tube. Special sizes can be manufactured upon request. The reticles shown are not to scale. Allow 3-4 weeks for delivery.

When ordering: Please give catalog number 296 followed by pattern number and desired diameter. For example: 296-E29-19 is the designation for a 19mm diameter Whipple Grid. When ordering Walton/Beckett or IMA reticles please view the linked calibration sheet. Custom reticles available upon request.