MEASURES POTASSIUM FOR BLOOD CHEMISTRY;INTERACT W/ION SPECIFIC MEMBRANE OF THE ELECTRODE;THIS INTERACTION RESULTS IN THE GENERATION OF AN ELECTRICAL POTENTIAL ACROSS THE MEMBRANE WHICH IS MEASURED POTENTIALLY;THE MAGNITUDE OF POTENTIAL IS PROPORTIONAL TO THE CONCENTRATION OF THE ION IN THE SAMPLE;FOR USE ON THE ABBOTT SPECTRUM;O/A LG 1.0 IN.;O/A WDTH 1.0 IN.;MATL PLASTIC