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The calibration piece is located under a ring at the eyepiece that is about 1-3/8" in diameter. There are keyhole's in it which allow you to rotate it which in turn will adjust the cross-hairs of the level up or down according to the direction being turned. You need to set the level exactly between two points which are roughly 100 feet apart. It is important that each point is at an equal distance from the level. If there is error in the instrument it will be exactly the same error for both readings. Therefore, the resulting elevation difference will be accurate. Take a rod reading on each point to determine their elevation difference. After the elevation difference is determined, place the instrument near one of the points at minimum focus distance. Take a reading on the close point. Calculate what the rod reading should be at the far point based on the known elevation difference. Take a reading on the far point and compare that to the calculated rod reading. If they do not match, adjust the instrument to match the rod reading calculated.

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