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If you need to calibrate something. Best of making a water level best level in the world. Get some clear tubing as long as you like fill it with water making shore there are no air bubbles in it. Then to get a true level put level on the wall separating the two ends of the tube let the water settle and mark the two point where the water is in the tube on the wall. This will give your a true level to calibrate of.
Phil
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