Rossmax HS200 Blood Sugar Test Strips can eliminate interference from oxygen variations and non-glucose sugar such as maltose and galactose, providing you with the most reliable and accurate results. They provide full warranty and is suitable for self testing. Each strip can be used ONCE ONLY!. A test strip consists of the following parts: Target Area: Where a blood drop or control solution is touched. Confirmation Window: To confirm if sufficient blood drop or control solution has been applied to Target Area. Contact Bar: The end of the test strip is to be inserted into the test port (top side facing up). On each test strip the target area contains reaction chemicals. When blood is applied to this area, a chemical reaction takes place, then a transient electrical current is formed. The blood glucose concentration is calculated based on the electrical current detected by the meter, then the result is showed on the display. The test measures glucose from 20 mg/dL (1.1mmol/L) to 600 mg/dL (33.3mmol/L). The Rossmax HS200 Test Strip is calibrated to display the equivalent of plasma glucose values to allow easy comparison of results with laboratory methods.