Optical Digital PD Ruler Pupilometer Pupil Distance Meter Tester Interpupillary Distance Scale Optometry Tool with Memory Function

Method of measuring PD:1. The measured person should sit down, facing the surveyor and is watching the behind surveyor 5m or move away from the fixture2. Then hold the PD ruler correctly and place it on the measured person's nose carefully3. The pupil center of right eye should be aligned to needle, then adjust the pupil center of the left eye, the numbers in the display window is the PD4. Press on the left black button, it shows the distance of left eye pupil and bridge of nose, press on the right black button, it shows the distance of right eye pupil and bridge of nose5. Repeat step 2 and 3, measure 3 times to get average valueSpecificationDimension: 215 x 122 x 44 mmWeight: 0.2 kgPackage Included:1 x PD Ruler1 x English Manual

• Digital PD Ruler, clear optical line, precise optical structure, easy operation and fast precise measure.
• Respectively: left or right monocular measurement. Display the results of two eyes separately on LCD screen.
• The digital PD ruler will turn off automatically when it is set level, save energy. With the memory function, you do not need to worry losing data.
• Operation: Put the tester over your nose, as close to your eyes as possible, then find the middle of your pupils in a mirror, read the line closest to the middle of the pupils. Then the number displayed on the LCD screen is your pupil distance(Unit:mm). Please keep your eyes looking straight ahead during the measurement. If you are a tester, please keep looking at the nose of your tester during the measurement.
• Warm Tips: The digital PD ruler is used to measure the distance between two pupils. This is a simple PD ruler, it can help you when you want to purchase eyeglasses online or in eye glasses store. If you require very high accuracy, this one is not recommended.