SPECIFICATIONS:

Binocular Pupillary Distance: 44 - 83 mm
Left or Right Pupillary Distance: 22 - 41.5 mm
Auto Shut Off: 1 1/2 minutes
Full digital operation.
Pressing the pupillary measuring key increases/decreases the distance of the pointer in increments of .5 mm.
Display window shows left & right monocular pupillary distances and total pupillary distance.
Also displays measuring state, optic distance and memory state.