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By Samantha Hoch, Marketing Specialist, Haws Eyewash testing gauges are an important tool when testing eyewashes and eye/face washes for ANSI Z358.1 compliance. Make sure you are utilizing it correctly with this quick guide. How To Use An Eyewash Gauge To determine a suitable eyewash pattern, the eyewash testing gauge should be a minimum of 4 inches in length with two sets of parallel lines equidistant from the center. The interior of the lines should be 3.25 inches apart. ( …