Stopped working -completely dead- after only a couple of months. Is there a quality worse than junk?

This worked great-until it didn't. It suddenly stopped working after 5 months. I got it because of the high ratings, but would not recommend it.

It worked about 4 times and after that it wouldn’t turn on anymore.

Does not work. Replaced batteries four times.

The made in China piece of trash could not work as the battery poles were manufactured incorrectly. Might be a good idea to stop doing business with this company.

It did not work at all

Battery connector falling out before using.

Item is defective need to return for money back. Battery contacts are loose so it won't make proper connection.

Never powered up.

This is not very accurate. Sometimes it reads and sometimes it does not. I can get a o2 reading of 82 then try again and it reads 89. Terrible product. Also don't do it if it is cold.