Accu-Chek Instant test strips come in sealed vials of 25 or 50 strips. They’re used with the Accu-Chek Instant glucometer. To use, insert a strip into the meter, apply a small drop of blood to the yellow edge, and the meter gives a result in about 5 seconds. The strip uses an enzyme to detect glucose and sends an electrical signal the meter reads. Use each strip once, and store them in a cool, dry place.