Feature: 1. Excellent Material: Optometry test tool is made of ABS material, with excellent mechanical properties, excellent impact strength, excellent wear resistance, excellent electrical insulation. This tool is almost independent of temperature, humidity, and frequency, and can be used in most environments. 2. Use for Maddox: Maddox is an important and indispensable tool in binocular visual function testing. Maddox can be used for horizontal and vertical recessive strabismus. 3. Easy to Operate: Strabismus inspection board comes with a stand and can be carried with you. Provide convenience for your use. 4. Vision Test: The optometry test tool is practical, easy to operate, and has important reference value for vision inspection. 5. Multiple Use: Optometry inspection board can not only check the near horizontal eye position, but also check the near vertical eye position, which protects our vision. Specification: Item Type: Optometry Test Tool Material: ABS Quick examination of eye position AC/A Power Supply Mode: 2 x AAA dry batteries (built in carrying), with a single capacity of 600mAh. Package List: 1 x Optometry Test Tool1 x Stand (color random)1 x Instruction Manual