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vee sügavus, kus vertikaalselt sukeldatud Secchi ketas pole veepinnalt enam nähtav, depth at which a Secchi disk disappears from view when lowered into the water
nähtavussügavus . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/n%C3%A4htavuss%C3%BCgavus/1/est (21.07.2026)
