My sister has been a diabetic for some years and has become very unstable recently with very high and low blood sugar levels coming on very quickly..leading to collapses..she is increasingly unable to know what is happening as the levels change so quickly even though she tests herself frequently with up to date blood glucose meters. I want to know more about non-invasive meters..do they work and where can I find more information. I have trawled the net and am not a lot wiser.I met an American recently and she had an implant of some kind that measured her levels on a dial..like a watch ..so she could always keep an eye on her levels without having to test all the time.Is there anything out there like that which means my sister can see immediately what her levels are with even a warning device available.Thank you for any help you can give