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GoVets offers Testing Tools, Meters & Comparators in the Inspecting, Detecting & Testing Instruments category to help customers complete their projects. Optical Flats & Monochromatic Lights are testing tools used to measure the flatness of surfaces and the accuracy of optical components. They are also used to detect surface imperfections and measure the wavelength of light. Shop today to find the right Testing Tools, Meters & Comparators for your project.