Two-Peg Test: Method for checking and recalibrating a ...
A-B. Say we get 1.524 at A and 1.501 at B, the elevation at B is 0.023. (It doesn't matter what the elevation above sea level is – we only need what its elevation is relative to A.) 3. Move the instrument to ~3m from position A, and get a new reading to A. Subtract the elevation at B (0.023) to get the foresight you should expect to get.
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