Huanyu Optical Digital Pupilometer 50-80mm Pupillometers Automatic Shut-Down PD Meter with Memory Function Pupil Meter CE Approved (LY-9C)

Works perfectly just like my $400+ Essilor brand pupilometer it replaced

I like this device and it does work well. you must have good overhead lighting to get good results. I don't see anything in the manual about the metal bar. It has to be pushed up (and it can because it's spring loaded) to get your nose to rest on the nose part of the device. The manual does not mention anything about this metal bar. Is it supposed to be kept in position for distance away from forehead? will this affect measurement? You can't properly position nose without pushing it up out of the way, so are you supposed to ignore nose gap on device? I do see where you have to keep it level, and it sees your pupils better with good overhead lighting. It does state to use the infinity setting for accurate measurement, so why is this setting even allowed to be changed? Manual is very lacking in proper instructions for this device. Slides for alignment seem to have enough resistance (stiffness to hold their place) to keep them in place once proper distance is achieved but I do wonder if they will get loose over time. Digital readout is extremely nice and auto on/off works fine, but kinda touchy to turn on if you move it around much. I would prefer an on/off switch instead. Battery area is not of the best design, not well protected, broadly open to circuit board. Access to batteries is good. Personally I would prefer some rubber material on sides and just a little ways in on top and bottom for more comfortable grip when measuring someones pupils. It isn't a major factor, but for it's price I would expect it. If your supposed to keep the metal bar against forehead, it should be flat with rubber grip on the part that does go against your head to get a more secure and comfortable position to read. The skinny round metal poking you in the forehead isn't the best nor comfortable design. Accuracy and ease of use both get a star loss because of these issues. Value for the money is what it is. To pay well over 100.00 for no more than it does is very steep in my opinion. I do not feel it costs no way near that much to make with what is there. From what research I done on Amazon before my purchase I do feel this is the best made device available.

Product works great for the cost. Can you offer any additional information regarding specs, or the item being calibrated.

Measurements are off in one eye. This is even after 2 exchanges. NOT accurate at all!

This is a well made device. It looks just like our last one minus the fancy brand logo and associated price. Works the same and no issues with any PDs that have been used to make glasses.

It seems to take the measurement ok. I might question the calibration. Slightly different readings than my other devices. The occluder switch that makes it go from monocular to binocular is loose. It has a little play in it. That makes me feel that the build quality could be better.

This is a very good product if you are an Optometrist and above all have someone else to measure your eyes.

This instrument outwardly looks very similar to the Essilor instrument but is not the same quality. Constantly need to fiddle with it. Purchased two at the same time - one arrived non-working and was sent back for replacement. Received replacement quickly. Both worked fine for about two weeks then on one of them the near/ distance dial started sticking in one position and became very difficult to change settings. Bottom line - I have one out of three that still works. Would not recommend purchasing. Not a professional quality product !!!