Feature:1. Easy to Use: Glossy edges with bridge design, good positioning and perfect matching make PD measurement easy and accurate.2. Wide Application: Easy and comfortable to use for right hand or left hand, also can be used for measuring eyeglass frame replacement.3. 5pcs: 5 pupil distance rulers in total, with clear data marking, suitable for ophthalmologists and opticians.4. Applicable Scenarios: Eye ophthalmology ruler tool helps you measure pupil distance and can be used for visual testing at home, school, hospital, etc.5. Plastic Material: Eye ophthalmic tool is made of plastic material, wear resistant and durable for long time use.Specification:Item Type:Ophthalmic PD RulerMaterial: Plastic Use: Eyelid Measuring Tape.Package List:5 xOphthalmic PD Ruler