A glucose monitor is a medical device used to measure the level of glucose in a person's blood. It is commonly used by individuals with diabetes to help manage their blood sugar levels. The device typically involves a small blood sample, which can be obtained through a finger prick, and provides results within seconds. There are two main types of glucose monitors: blood glucose meters and continuous glucose monitors (CGMs). Blood glucose meters require manual testing at specific times, while CGMs provide real-time glucose readings throughout the day. Both types help users make informed decisions about their diet and medication.