Hi @sue44 the information for the range should be on the control bottle or box it came in. Not all control solutions will have the same range. The control solutions will be different. The range depends on which solution you get. The control solution is what is used to determine if a meter is functioning correctly. It is the test. Before, I was responsible for testing all the blood glucose meters. I needed to be certain the meters were functioning correctly before allowing staff to administer the right insulin doses to patients. If you have any trouble finding the info, I will help you find the location. Toni