Precision Xtra, Blood Glucose Test Strips, 100 eachProduct Description Simple Testing With Xtra Assurance and Control For Use With Precision Xtra Systems Fast 5 Second Countdown Small Sample Product Benefits Ingredients Glucose Dehydrogenase (GDH NAD); NAD+; Phenanthroline Quinone; Non reactive Ingredients Suggestions Simple 2 step testing. Insert the test strip. Add a droplet of blood to the top or end of strip. Countdown designed to start only when enough blood is applied. Store at temperatures