A blood glucose meter is a medical device used to measure the concentration of glucose in a person's blood. It is commonly used by individuals with diabetes to monitor their blood sugar levels. The device typically requires a small drop of blood, which is obtained by pricking the skin with a lancet. The blood is then placed on a test strip, and the meter provides a reading within seconds. These meters are essential for managing diabetes, as they help users make informed decisions about their diet, exercise, and medication. Regular monitoring can prevent complications associated with high or low blood sugar levels, ensuring better overall health for those living with the condition.