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tubular level which is used to ensure that the vertical index of a vertical angle reading is correctly positioned in relation to the plumb line, torulood, mida kasutatakse selle tagamiseks, et vertikaalnurga all oleva näidu vertikaallugemiviit oleks nöörloodi suhtes õigesti paigutatud
index level . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/index%20level/1/eng (06.07.2026)
