PD Meter
1.Use battery.
2.Power off automatically .
4.Correct measure.

PD Meter

Techinical data:
Measure range: Two eye pupil distance: 44~83mm
Availability measure range: Two eye pupil distance: 22~41.5mm
Left/right distance: 22.5~41mm
Show error: ≤ 0.5MM
Rounding error: ≤ 0.5MM
Can measure single eye.
Aim distance: 30cm~∞
Power: DC 6V 4PCS of batteries.
Shut off the power by itself: 1 min after stopping of using.
Size: 214MM*150MM*51MM
Weight: 0.8kg