Horisontaaljoont tekitav seade võib põhineda nii mehaanilisel kui ka optilisel mõõtmisel, nt horisontaalne tugijoont/-tasapinda tekitav optiline/ laserseade koos mehaanilise kõrgusmõõturiga.
Leveller can be based on either mechanical or optical measurements. For example rotating optical/laser instrument that establishes horizontal reference line/plane, with a mechanical height-measuring device.
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