Review on Pulse oximeter on a finger Fingertip Pulse Oximeter LK87 measurement of oxygen and pulse. by Adam Dziarnowski ᠌

1) the device came without batteries, so it was not possible to check it immediately with the courier 2) with the batteries bought for him, he also does not work 3) and finally, an unpleasant trifle - the lack of instructions in 2022, whatever and wherever. Which, as far as I know, violates consumer rights. The instruction in English is so small, a sheet with text about the size of a matchbox! That you can read it only in a powerful double jewelry lens! Fortunately, I did not have to read it completely, since the device arrived NOT WORKING, BROKEN, MALFUNCTIONAL!