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.