The digital PD ruler is used to measure the distance between two pupils. This is a simple PD ruler.
The Function of measuring ruler is close to the measured value that we need when we wear the glasses.
The digital PD ruler is used to measure the distance between two pupils. This is a simple PD ruler.
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.
Power Requirement 23A 12V Battery.
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