Review on 📱 Advanced Smart Watch: Fitness Tracker with Body Temperature, Blood Oxygen, Heart Rate, and more - IPX7 Waterproof for Women, Men, and Kids by Zachary Cha

I am an engineer and I have checked all measurements very carefully on calibrated instruments. The result showed that all readings are far (not even close). I cannot recommend this fitness tracker. Spend a little more money and get something you can trust. (It's your body and it's worth it). There is also no oxygen gauge in the app. Contacted the manufacturer who only had to say "sorry". This is unacceptable. Fix your watch and app then you can sell some.