Review on 👓 Huanyu Digital Pupilometer Optical PD Meter with LCD Display, CE Approved - 45-82mm Pupil Meter LY-9S by Kendrick Breezy

I bought this unit from another Revain seller 4 months ago and it is now out of stock. The squeaky plastic was an issue for me and the way the push button aspect amplified the squeaky sounds. But more importantly, I now have to press the power button a few times to turn it on. It turns on briefly and then off again. I have to repeatedly and rapidly press the power button 3-5 times before it stays on.