The Insize 4191-45B Optical Flat is a precision inspection tool designed for checking surface flatness with extremely high accuracy. Manufactured for precision engineering, metrology, and calibration applications, this optical flat provides reliable flatness verification for precision surfaces, gauge blocks, measuring tools, and machine components. Featuring a single working face identified by an arrow marking, the optical flat allows accurate interference pattern inspection when used with monochromatic light sources. Its precision-ground optical surface ensures dependable measurement performance for laboratory, workshop, and quality control environments. Key Features & Benefits Precision optical flat for surface flatness inspection Suitable for checking high-precision flat surfaces Single working face with directional arrow indicator High accuracy flatness tolerance of 0.1µm Precision optical-grade manufacturing Reliable interference pattern inspection Ideal for calibration and metrology applications Suitable for workshop, laboratory, and inspection use Excellent stability and repeatability Designed for professional quality control applications Technical Specifications Part Number: 4191-45B Product Type: Optical Flat Diameter (ØD): 45mm Thickness (b): 12mm Flatness: 0.1µm Working Face: Single face Application: Flatness inspection and verification Applications Surface flatness inspection Gauge block verification Precision engineering inspection Metrology laboratory applications Calibration and quality control Machine component inspection Optical interference testing Precision manufacturing inspection Insize optical measuring instruments are trusted worldwide for their precision engineering, dependable accuracy, and reliable performance in industrial metrology and inspection applications. The Insize 4191-45B Optical Flat provides accurate flatness verification for precision measurement and calibration applications requiring high inspection accuracy.