Optometry Optical Pupilometer, Digital Pupillary Distance Meter, Tester Interpupillary, PD Ruler with Memory Function CE Certificate

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 fixture 2. Then hold the PD ruler correctly and place it on the measured person's nose carefully 3. 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 PD 4. 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 nose 5. Repeat step 2 and 3, measure 3 times to get average value Specification Power: Battey DC 12 V 23 A 5 W Dimension: 215 x 122 x 44 mm Weight: 0.2 kg Package Included: 1 x PD Ruler 1 x Manual

• 【OPERATION PROCESS】 Place the tester on your nose as close to your eyes as possible, then look in the mirror to find the middle of the pupil, and read the line closest to the middle of the pupil. At this time, the number displayed on the LCD screen is your interpupillary distance (unit: mm). Please keep your eyes looking straight ahead when measuring. If you are the tester, look at the tester's nose during the measurement.
• 【ACCURATE】More accurate than vernier PD ruler. The two white lines appear very clear against the dark pupils, and the pupil distance is displayed on the LCD screen. What's more, it can measure monocular distance independently. When the centers of the two pupils are aligned with the white line, press the left (right) black button to display the distance from the left (right) eye pupil to the bridge of the nose.
• 【POWER-OFF MEMORY】The digital PD ruler will automatically turn off when set horizontally, and will automatically turn on when used vertically to save energy. With memory function, you don't need to worry about losing data.
• 【WARM TIPS】 The digital PD ruler is used to measure the distance between two pupils. This is a simple PD ruler that can help you when you want to buy glasses online or at an optical store. If you have very high accuracy requirements, this is not recommended.
• 【WITHOUT BATTERY】The pupillary distance meter requires a battery for use. Due to long-distance transportation, the battery needs to be removed. Batteries are not included in the package. (23A, 12V battery)