There are two methods of blood glucose monitoring, the finger stick method using blood glucose meters, as seen in the photo on the bottom left, and the continuous or flash glucose monitoring using sensors attached to your body, seen in the image on the bottom right. The links below will bring you to pages that provide a lot more detail on how these methods work and lots more.
Blood Glucose Meters & Test Strips
Continuous & Flash Glucose Monitors
Continuous Glucose Monitors and Flash Glucose Monitors measure glucose using a sensor which is worn on the body that transmits a reading to a receiver device.
The most common method to check glucose levels is the finger-stick method using a blood glucose meter. This is also known as self-monitoring of blood glucose (SMBG).