Checking on horizontal distances on even ground seems easy enough, but most often the ground will be sloping, especially on raw spaces. Moreover, some cases will be that grasses are all over the plane that you would have to lift your measuring tape just the same. In such cases that it would be impossible to lay the tape to the ground, the method of "breaking tape" is the most feasible thing to do.
Breaking tape is the procedure when measuring horizontal distances should be done in partial segments. The procedure would require a little bit more than laying the tape horizontally but checking on the vertical alignment of the starting the ending points altogether. That is the procedure when you would need the use of a plumbob.
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In doing this procedure, it would be best to have short segments than long ones in order to reduce the error due to tape sagging. Another cause of error is for the misalignment of the points when working on different segments. Note that at some point, the ending point would have to be reflected a little distance up the ground.
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