The DPM-30 is faster to use and more accurate than a PD ruler. It's durability and ease of use will provide you with years of trouble-free service.
DPM 30.2Features Include:
Cornea reflection light coincidence method
Left/Right distance: 25-40mm
Internal green dot focus point
Single eye measurement available
Power saving mode: automatic shutoff after 1 min of idle time
Measures tops of corneas to edge of lens/frame