Bests & Worsts Reviews from Amazon

I am a RN and bought this for use at the hospital. I took it to work last night and tested it against other O2 sat monitors at work and it is very inaccurate. I put it on myself and other people and the O2 sat was registering as low as 89% when the real sat was 97%,Do not trust this monitor. This is the first return I have ever made to Amazon and I shop here a lot. Thanks to Amazon for there great refund and return policy. I hate to write this review because Amazon is a great company but I feel that people should know that if they are using this product that they need to check it against other monitors and not trust the reading on it.