1ACCURATE MEASUREMENT: The measurement accuracy of the microscope calibration slide ruler is 0.01mm, which ensure accurate and reliable measurement and meet the needs of professionals for high accuracy microscope observation and analysis 2WIDE APPLICATIONS: The microscope calibration slide ruler can be used not only for microscope measurement and calibration, but also for specimen examination, providing versatility in scientific research, laboratory work, educational settings, and other areas that require microscopic analysis 3SAFE PACKAGING: The microscope camera calibration ruler is safely packaged in a box with a sponge plug in to ensure luxurious, safe storage and transportation. Protective packaging maintain the integrity of the slide and provide convenience to the user 4PROFESSIONAL GRADE: Microscope calibration boards are designed for professional users and meet the standards and requirements of professionals in various scientific disciplines, providing quality, accuracy and reliability for accurate and consistent microscope measurement and calibration procedures 5APPLICABLE SCENARIO: This is a special calibration ruler for microscope measurement, used with microscopic lenses, stable, useful and practical 1 x Calibration Slide 1 x Storage Box