I didn't check more than 100 banknotes and now suddenly it doesn't recognize anything and they want about 40 euros plus courier fees to send it to the company to recalibrate it. Stay away

So much money and it's useless... unfortunately, after a while everything turns out to be fake. And some, after many attempts, turn out to be okay... for throwing away

(updated Feb2022). I returned it to the merchant for inspection and calibration. I received it back and until today - after being checked several times - it has not presented any problems. The merchant responded quickly and the Greek representation is excellent!!! Four stars only for the initial issue that occurred :)
{The initial evaluation is negative. It detects problems in specific banknotes, which another competitive device (Cas tester) passes without any issues. When you pass the banknotes again, it accepts them as okay. It creates insecurity. It was returned to the merchant for inspection and calibration or replacement. The Admate Hellas representation is excellent in service. Communication via messenger even very late at night. Well done, as long as the issue with the device is resolved}

It takes the banknotes from the front, scans them, and takes them out from the back, so this makes the process a bit difficult by itself. It would be preferable, easier, and perhaps safer for it to return them to the front in your hand.
Sometimes slightly crumpled banknotes need to be passed through 2 or 3 times to be read, while I have noticed that other machines do it in one go.
Overall, it is a good and reliable machine, but it has these two small imperfections in my personal opinion.