The CONTROL SOLUTION is a red liquid that a fixed amount of glucose that resembles blood. It is used to test the accuracy of the meter and the test strip. Applied to a strip, the solution confirms that the meters test results are in the expected range that is printed on the test strip vial. The purpose of the solution allows you topractice testing without having to use your own blood. To insure that the meter and the test strip are working together properly. To check that the correct testing procedure is followed.