This set of Test Strips for Blood Glucose help you monitor your health. They include instructions to make it easy to properly use and read them. These TRUE METRIX® PRO test strips by McKesson are intended for use with several models of McKesson glucose meters.These meter test strips for blood glucose work by measuring the electrical current given off by the electrons of the glucose in your blood. They can deliver results in as little as four seconds to help save you time. They do not contain natural rubber latex, so you won't experience skin allergies that can cause irritation.