2 Pieces Measure Optical Vernier PD Ruler Pupil Distance Meter Eye Ophthalmic Tool

2 Pieces measure optical vernier pd ruler pupil distance meter eye ophthalmic tool Features: Convenient and efficient: When you want to buy glasses online or don't want to go to a hospital far away, this distance meter eye ophthalmic tool can help you quickly measure your pupil distance. Sturdy and durable: This measure optical vernier pd ruler is strong, durable and not easy to bend, which can serve you for a long time. Specifications: Material: plastic Color: as the picture shown Size: approx. 21 x 5 x 0.7 cm/ 8.26 x 1.96 x 0.27 inch Package includes: 2 x Vernier PD rulers Note: Due to manual measurement, please allow slight differences on size. There might have slight color differences due to different displays. It is better to ask a family member or friend to measure for you.