SUNWIN Straight Edge PD Ruler Pupillary Distance Ruler (Straight Edge PD Ruler)

SUNWIN Straight Edge PD Ruler Pupillary Distance Ruler (Straight Edge PD Ruler)

• The pd ruler can help you when you want to buy glasses online.(Some customer complain about that the parts can't move apart ,you don't worry ,there were screw which you can loose it ,it can move smoothly )
• Put the notch over your nose, as close to your eyes as you can, then find the middle if your pupils in a mirror, read the line closest to the middle of the pupils.
• Screw thickness gauge both printed on the rear of the ruler.They are comfortable, lightweight and medium thickness, Choose from two different styles. Nose bridge holds the rules stationay and perfectly centered. Measures from the center outward to give both monocular PD readings without subtration or moving the ruler.
• They accurately measure Puillary Distance with three different printed scales.
• Note that this does not come with any instructions, so if you don't know how to take a PD measurement, you will need to look that up on the internet.

What is in box ?<br>1 pcs x PD ruler