Glucose meters are small battery-operated devices to measure the glucose levels in the blood. To test for glucose, place a small blood sample on a "test strip" and the strip in the meter. The meter measures how much glucose is present. The meter displays the glucose level as a number.
Some meters measure the amount of electricity that can pass through the sample. Others measure how much light reflects from it. Certain models record and store a number of test results. Some models can also connect to PCs to store test results and print them out.