The TE293 fits neatly into the iQ-Chartmount "+1 Position," the rearmost slot, and provides an easy way to position test charts of various sizes on its magnetic surface. It shows the outlines of our standard test chart sizes up to A460 to help you find the center position quickly. The background of the chart is nearly neutral gray with 18% remission. The test charts must be fitted with magnetic tape (tape sold separately). Please note that the TE293 is not a test chart but is a holder for other charts. *Example image may not represent final product.