A glucometer is a medical device used to measure the concentration of glucose in the 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 sample is placed on a test strip, and the glucometer provides a reading within seconds. Glucometers come in various models, some of which connect to smartphones for easier tracking of blood sugar levels over time. Regular monitoring helps individuals manage their condition and make informed decisions about their diet and medication.