Control solution is used to test the accuracy of your blood glucose meter and test strips. Applied to a test strip, control solution confirms that the meter's test results are in the expected range printed on the test strip vial. Each control solution contains a known amount of glucose. If the control result is within an acceptable range, you know that the monitoring system is working properly. TRUEcontrol Level 0-Low, Level 1 Hi. For use with TRUEread, TRUEtrack and Sidekick Blood Glucose Test Strips. 3ml.