seade, milleks võib olla nt optiline täppisripplood, pentaprismaga täppislood või pentaprismaga täppisteodoliit
device, which can be, for example, a precision optical plummet, a precision engineer's level with a pentaprism attachment, or a precision engineer's theodolite with a pentaprism attachment
An optical-reference-line device is an optical instrument with a means of attachment to either a tripod, magnetic bracket or other stable means of support.
