LED display leveling instrument is provided with a angle the value sensor circuit system, the system set horizontal, vertical or 45 degrees angle of qualified regional(error is 0.1)second qualified regional (error is 0. 1-0.5 ), the disqualified regional(error >0.5 above); when the analyte is different eligibility status LED will be a different color, a different way of lit display, show the results of high accuracy, good reliability.