Glucose meters; Blood glucose meter; Devices for monitoring blood glucose for medical purposes; Electrochemical sensors for determination of analyte concentrations in fluids for medical purposes; Devices for measuring blood sugar; Medical instruments for measuring and displaying analyte concentrations, such as sodium ion or potassium ion, and/or glucose level in blood or interstitial fluid; Patient medical monitors for monitoring analyte concentrations, such as sodium ion or potassium ion, an...