FIELD: medicine.SUBSTANCE: group of inventions refers to medicine, namely to monitoring a biological analyte. Disclosed is a device comprising a unit for inserting a strip, into which a test strip is to be inserted, and a processor configured to read the code sequence based on the element detected in the index section, the first code segment and the second code portion of the test strip, in response to inserting the test strip into the strip insertion unit. Processor is additionally configured to: determining a target interval in which an index element formed in the index section is detected when the test strip is inserted into the strip insertion unit； detecting a first code element formed in a first code segment in a target interval and detecting a second code element formed in a second code segment in a target interval； and identification of code sequence proceeding from detection result of first code element and second code element. Disclosed is a test strip comprising a film base, an electrode portion disposed on one surface of the film base, and a layer on one surface of which an enzyme substance is applied and which is formed on at least part of the upper surface of the electrode part for collection of the biological analyte. Electrode portion comprises a reference element formed elongated in direction of insert, in which test strip is inserted into device for monitoring biological analyte； m sections with a first element, m sections with a second element and m index elements, where m denotes an integer greater than or equal to 1； wherein each of the index elements overlaps with at least part of the section with the first element corresponding to the corresponding index element, from among sections with first element and at least part of section with second element corresponding to corresponding index element, from number of sections with second element in direction perpendicular to insertion direction, and if m is greater than 1, then m sections with first e
