The screen is small, they don't look big like in the picture, as for the measurement I don't know if it's accurate. For 5 euros, it's acceptable.

If you want to throw away your money, then buy it.
Honestly, I wonder how they dare to sell such a lousy product!
Zero brightness and of course, completely unreliable since it doesn't even measure most of the time, and when it does, the results are completely different from others... It showed me that I had 83 oxygen at some point.

Slow never shows never shows !!! The indication is not visible even in the dark. It is impossible for an elderly person to see !!! Un a c c e p t a b l e.
I bought 8 for professional use, all problematic!!!

Apart from the fact that the measurements differ greatly each time, the worst thing is the cheap construction quality and the poor brightness of the screen, which essentially affects measurements visible only in the dark. I have purchased 2 units and confirmed that it is not simply a defective device.