9. Compare the four lines by drawing a straight line along the lowest and highest reference lines. If the distance between these two lines is less than the Total allowable deviation of 9mm at 15m or 18mm at 30m, the instrument is properly calibrated. However, if the measured deviation is more than the stated tolerances, repeat the accuracy check procedure. Should the readings persist over the allowable deviation, the instrument is OFF calibration. Contact ToughBuilt ® Customer Service for additional support.
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