One bloodless glucometer is the GlucoWatch, which gets a reading via a membrane that extracts fluid from the skin. Another bloodless glucometer is the GlucoTrack that gets the reading through a clip that you place on your ear and uses either light-sensing or ultrasound technology.
These are both experimental products that have some downsides and faults. Webmd.com says that the most efficient way to check your glucose level is through internal body fluids. It is difficult to check glucose levels accurately and effectively any other way. But with the growing number of diabetic Americans, companies are rushing to find noninvasive options that are easy and painless.