Features： 1、Waterproof: The surface of the vision tester ruler has a matte coating, which is waterproof and stain resistant, and is very easy to clean. 2、Clear Pattern: The pattern and text on the vision tester tool are clearly printed, with natural colors, making it more convenient to use. 3、Wide Application: Vision tester tool is small in size and light in weight, and can be used for vision tests at home, schools, hospitals, etc. 4、Portable: The thicken vision tester is light in weight, about 8g, you can put it in your bag and you can take the vision test anytime. 5、Thickened: The check vision tester uses 2mm thickened material, which is very durable and can be used for a long time, and the quality is assured. Specification： Item Type: Check Vision Tester Material: Plastic Size: Approx. 18 x 5cm / 7.1 x 2in Function: Vision test Package List： 1 x Check Vision Tester