Back in my auto electrical days we used to stand directly in front of the car with it on low beam. Place your finger on your leg where the main beam hits it. Take ten steps away from the car (night time only and on level ground) and the main beam should still be hitting the same point (on you leg that is). I used this method and it always past inspection for roadworthy in the N.T. where they had a special wall with markings to show if it was within calibration.
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