Features: brand new and high quality It is made of durable plastic with matte finish to avoid reflective and glaring effect. The for vision activity instrument is more scientific for ideal for use with patients who are illiterate or not familiar with the Roman alpha-bet or cannot speak, students, optometrists, offices, & schools. Widely used to measure visual acuity by determining the clarity of detailed distance for vision that a person can discriminate. Test your level with eight lines or the letter "E" pointing in different directions at green and red bars. The 7.75x5.78 inch eye chart can be used with Illuminated Eye Test Cabinet or wall-mounted with required 10 feet away from viewer for vision testing. With magnetic, it's easy to change for vision chart, small size, easy to carry. Specifications: Material: Plastic Size: 19.7x14.7cm/ 7.75x5.78 in Package Includes: 1x Acuity Chart for Vision Tester note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.