SD Codefree blood glucose test strip is designed with an electrode that measures glucose levels. Glucose in the blood sample mixes with reagent on the test strip that causes a small electric current. The amount of current that is created depends on how much glucose is in the blood.
The blood glucose result is displayed on the screen.
In strip stand by display, if you press the ON/OFF button for 3 sec, the display for setting the beep will appear the first step of the setting mode.