45~82 mm Optical Digital Pupillary Distance Meter LED PD Meter Pupilometer Interpupillary Distance Measuring Tool Ophthalmic Equipment with LCD Display Optical Pd PDs

More accurate than the plastic ruler, FYI it’s battery powered

Bought this only 2 1/2 months ago and it already does not work correctly. Not taking measurements accurately. My return window is over and I am very disappointed.

Works just as well as the expensive popular brands. No problems to date.

It is cheap but does the job. You can do split PDs, and distance and near measurements...pretty much what I needed.

An easy to use pupillometer. Needed for the office.

Works great and the cost was reasonable.

It never worked.

My wife is a 20 year O.D. and I'm the Optical manager of our eye care practice.1. This instrument feels cheap. It was very hard to insert the battery and the controls feel rough and sloppy.2. The magnification for the viewer window is a nice touch but the selector switch for it was very hard to move.3. MOST IMPORTANTLY: This only actually measured Distance PD. It does math to estimate other distances, so near PD may be wrong.4. It turns off automatically too soon... often while you're still trying to get a good measurement.We are sending it back. Our last pupilometer was about the same price and shared none of these problems. Sadly, it does not have the brand labeled anyplace on it and we cannot remember the brand/model.