The CardioChek analyzer is a hand-held, battery-powered instrument that uses a test methodology called reflectance photometry. When a blood sample is applied to the test strip in the analyzer, a series of chemical reactions occur, which ultimately produce a color change on the back of the test strip. The CardioChek analyzer then compares the intensity of the color to the calibration information stored in the MEMo Chip to calculate and display the test result. Monitor only, item code for test strips (CCSP2412).