Self-testing of glucose by patients living with diabetes mellitus (DM) involves needles, which can cause discomfort or inconvenience; these and other factors can lead to decreased willingness to perform these checks that are vital to DM management. While technology has evolved, a needle-free glucose monitoring device is currently not available. The investigators are studying a glucose sensor that adheres to the skin, similarly to a temporary tattoo. This sensor can now obtain continuous readings. As it has not yet been tested in individuals with DM, this study will examine its accuracy and acceptability in these patients. Results from this clinical trial could serve as the basis for further development of a non-invasive, wearable glucose sensor that can provide measurements of glucose levels continuously.

Inclusion Criteria:

• An existing diagnosis of diabetes mellitus, either T1DM or T2DM, or any other type or etiology of diabetes
• Ability to provide informed consent for participation.

Exclusion Criteria:

• Individuals without diabetes
• Those who cannot speak or read English. We are limiting participation to those who read and speak English, as this is a pilot study of a small number of participants, that will very unlikely offer the prospect of direct benefit from participating.
• Individuals who have frequent hypoglycemia, hypoglycemia unawareness, or who are at high risk for hypoglycemia.