... calibrator under camera,first calibration X axle£» press CAL button until 3 munites ,on screen can be display ... between distance equal to calibration length,and press CAL button,on the left screen can show the ... calibration X ,little different is when you press on CAL button then off,should be continuous 5 times ... factor,then adjust the lens,then through SEL button to move the 2 parallel lines survey ...