My third attempt trying different products, Works as advertised, with a reasonable a app for your Android Device.
Just wish the App had a memory feature :-( .
Device has a high price, but item quality is great, works better as I can imagine, I use it for performance testing, some other devices fail to show the SmO2 due movement when performing an activity, and this devices works great
Very accurate and reads whit colder fingers which I have. The app for android needs to be updated as it has trouble working properly but not the fault of the unit which is great.