Are there any non-invasive glucose meters available?

Yes. Non-invasive glucose monitors are available but they shouldn’t be substituted for regular blood testing. These devices monitor glucose levels by drawing interstitial fluid through sweat glands in the skin by means of a small electric current. Glucose concentrations are measured in this fluid. It does not measure blood glucose, it does however identify patterns in glucose levels. This is an emerging technology so their are only a few available.