mõõteriist püst- või rõht-, harvemini ka kaldsihi mõõtmiseks või kontrollimiseks, mõõteriist täpse püstsihi ning selle sihi suhtes täpse rõhtsihi ja nende sihtidevaheliste kaldenurkade mõõtmiseks (loodimiseks), measuring instrument used to establish or verify points in the same horizontal plane in a process known as levelling, and is used in conjunction with a levelling staff to establish the relative heights levels of objects or marks, instrument for measuring differences in height by establishing horizontal lines of sight, comprising as main components a telescope which can be rotated on a vertical axis and a facility for levelling the line of sight