Tech Tip Tuesday: How Do You Test The Depth Of An Etched Cliché On A Polymer Plate?

We use a microscope attached to a digital readout that is sensitive to 0.01 microns to test the depth of an etched cliché. The microscope is focused on an un-etched section of the cliché, the reading is set to zero then the scope is re-focused on the etched area which yields the depth measurement. This procedure is then repeated 5 times in different sections to confirm the consistency of the etch.