Precision Xtra, Extra Blood Glucose Test Strips, 50 eachProduct Description Easy to Use Fast and Accurate Small Blood Sample Product Benefits Ingredients Glucose Dehydrogenase; NAD+; Phenanthroline Quinone; Non reactive Ingredients Suggestions Easily apply blood sample to top or end of test strip. For virtually pain free testing, use forearm or upper arm. Store at temperatures between 39 86 degrees F (4 30 degrees C). Discard test strips after single use. Special Note Warnings For in vitro diagnostic use