This standard specifies measuring instruments (hereinafter referred to as measuring instruments) for measuring the glucose concentration contained in samples such as blood, urine, fermented liquid, food, etc. This standard applies to devices based on the enzyme electrode method using glucose oxidase or glucose dehydrogenase, that is, any of the following enzymes - glucose oxidase - glucose dehydrogenase and any of the following electrodes that electrochemically detect the reaction. It is applied to a device that combines one oxygen electrode, one hydrogen peroxide electrode, and one electrode that measures the current based on the oxidation of a reduced electron mediator.