2 Pcs PD Ruler, Pupillometers for Measuring Pupillary Distance, Single PD or Dual PD Measurement Tool

Production Description: 1: SIZE: The distance in the PD measuring range in millimeters: 23mm~42mm on each side, complete PD is between 46mm to 84mm. 2: MATERIAL: Made of high quality PVC material, lightweight, flexible, high transparent. 3: DESIGN: Classic straight-edge design is suitable for both eyes, and the nose bridge design helps to keep the PD ruler centered and fixed to ensure accuracy. 4: APPLICATION: Three different printing scale functions can be measured on a ruler, single PD or double PD. 5: GENTLE REMINDER: Instruction manual for PD measurement is not included, but it can be easily found online. If you need help, please contact us. Package Included: 2 Pack PD Ruler