PD Meter Digital Pupil Distance Meter PD Ruler Pupilometer with Memory Function

Description

【Operation】It is recommended to have a second person help you while testing. Put the PD Meter over your nose, as close to your eyes as possible. Then find the center of your pupils, the white line should be aligned with the center. The number displayed on the LCD screen is your pupil distance(Unit:mm). Please keep your eyes looking straight ahead or at the nose of your tester during the measurement.
【Precise】It is more precise than Vernier PD Ruler. The two white lines is very clear against the dark pupil and the pupil distance is displayed in the LCD screen. What's more, it can measure monocular distance separately. When two pupils centre are aligned with the white lines, press the left (right) black button, it shows the distance between left (right) eye pupil and bridge of nose.
【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 eyeglasses store. If you require very high accuracy, this one is not recommended.
【Powe off and Memory Function】The digital PD ruler will turn off automatically when it is set level and turn on automatically when using it to save energy. With the memory function, you do not need to worry losing data.
【Without Battery】Due to long diatance transportation, the battery is taken out. (23A,12V battery)
【Operation】It is recommended to have a second person help you while testing. Put the PD Meter over your nose, as close to your eyes as possible. Then find the center of your pupils, the white line should be aligned with the center. The number displayed on the LCD screen is your pupil distance(Unit:mm). Please keep your eyes looking straight ahead or at the nose of your tester during the measurement.
Product Description
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 eyeglasses store
.
If you require very high accuracy, this one is not recommended.
Features
The function of measuring ruler is close to the measured value that we need when we wear the glasses.
The measuring ruler will be turned off automatically when it is set level. Turn on automatically when use it. Protect the battery using life.
How to use this PD meter ?
It is recommended to have a second person help you while testing.
1. The measured person should sit down facing the surveyor and watch to a fix place.
2. Place it on the measured person's nose carefully.
3. The pupil centre of both eyes should be aligned with the white lines. The number displayed in the LCD screen is the pupil distance of two eyes. (Unit:
mm
).
4. Press the left(right) black button, it shows the distance between left(right) eye pupil and bridge of nose.
5. Repeat the steps TWO and Three times to get the average value.
Detail Display of Hanchen Digital Pupil Distance Meter
More precise than vernier PD ruler
The digital pupil distance meter is
more precise
than Vernier PD Ruler. The two white lines is very clear against the dark pupil and the pupil distance is
displayed in the LCD screen
.
Can measure monocular distance separately
The PD meter
can measure monocular distance separately
. When two pupils centre are aligned with the white lines, press the left (right) black button, it shows the distance between left (right) eye pupil and bridge of nose.
Memory function
According to the alignment degree in the photo, surveyor No. 2 instructed surveyor No. 1 to adjust the moving direction of the needles, and then to take a photo again. Therefore, the accuracy of the measurement results will be higher if it is repeated several times. You can choose the most accurate one or you can take the average of the values.
Auto shutdown function
When the digital PD ruler is
placed flat
on your desktop, it will
automatically shut down
.
HOW TO MEASURE MORE ACCURATELY
Step 1
Surveyor No. 1 put the meter on the nose of the measured person, and the measured person fixed his sight in one place. Surveyor No. 1 stood in front of the measured person and aligned the needles with the measured person's pupil.
Step 2
Surveyor No. 2 recorded the current measurement in the form of mobile phone photos. (When the surveyor No. 1 holds the meter and the needles are aligned with the pupil of the measured person as much as possible.)
Step 3
Due to visual error of naked eye, we can more clearly see whether the needles are aligned with the pupil with the help of mobile phone photo imaging (As you can see in our real shot, the pupil and the needles are basically aligned to a high degree.)
Step 4
According to the alignment degree in the photo, surveyor No. 2 instructed surveyor No. 1 to adjust the moving direction of the needles, and then to take a photo again. Therefore, the accuracy of the measurement results will be higher if it is repeated several times. You can choose the most accurate one or you can take the average of the values.
Parameters
Model: HE-710
PD measuring range: 44~80mm
Left or right pupil distance: 22.5~41mm
Power supply: 23A,12V battery ( The battery not included. It's easy to be bought at supermarket.)
Power: 5W
Package size: 215*122*44mm
Net weight: 0.2kg
Indication Error: 0.5mm
Asymmetry Error: 0.5mm
Rounding Erro: 0.5mm