Precision optical glass 10 x 10 cross ruler for eyepieces and inspection optics. Durable construction and stable performance make this reticle suitable for accurate measurement, alignment, and visual referencing in a range of optical applications. Key features and benefits Material: Optical Glass for clear, stable imaging and long service life. Scale accuracy: DIV = 0.1 mm for fine measurement resolution and repeatable readings. Reticle layout: 10 x 10 cross ruler provides a clear grid for positioning, counting, and size estimation. Sizes available: Diameter 16 mm, 19 mm, 20.4 mm, 22 mm, 23 mm, 24 mm to match common eyepiece diameters. Color: Diameter 19 mm. Construction quality: Made from quality materials for durability, stable performance, and longterm use. Easy to install: Designed to fit standard eyepiece sockets that accept the listed diameters. Why choose this product Accurate measurements: The 0.1 mm division and dense 10 x 10 grid allow precise measurement and comparison without additional tools. Reliable in repeated use: Optical glass and solid construction resist wear and maintain calibration over time. Versatile compatibility: Multiple diameter options enable direct replacement or addition to many microscopes, inspection scopes, and other optical instruments. Simplifies tasks: The clear cross ruler reduces setup time for alignment, inspection, and documentation. Typical applications Laboratory microscopy: Use the reticle for size estimation, cell counting reference, and calibration of magnification scales. Industrial inspection and quality control: Position and measure small components, check tolerances, and document part alignment under magnification. Optical alignment and calibration: Install in eyepieces for aligning lenses, setting up imaging systems, or comparing focal planes. Compatibility and selection tips Choose the diameter that matches your eyepiece inner diameter or holder: 16 mm, 19 mm, 20.4 mm, 22 mm, 23 mm, or 24 mm. Confirm fit before installation to ensure the reticle seats securely and the grid is centered in the field of view. For a standard color and diameter reference, see Color: Diameter 19 mm. Product specifications Material: Optical Glass DIV: 0.1 mm Reticle: 10 x 10 cross ruler Diameter options: 16 mm, 19 mm, 20.4 mm, 22 mm, 23 mm, 24 mm This optical glass cross ruler is a practical, longlasting accessory for precise measurement and alignment in microscopy and inspection workflows.