Standard-conforming　measurements　for　a　large　involute　gear　were　performed　with　a　manually　operated　laser　tracker　system　and　the　corresponding　task-specific　measurement　uncertainties　were　estimated.　Especially,　readers　using　laser　trackers　for　inspecting　large　involute　gears　will　get　information　of　a　taskspecific　measurement　performance　for　the　first　time,　which　significantly　differs　from　the　laser　tracker　machine　specification.　To　ensure　unambiguous　and　repeatable　measurement　results,　user-friendly　auxiliary　tools　are　used,　which　allows　the　operator　to　probe　the　measurement　points　according　to　existing　guidelines　and　standards.　Measurements　were　taken　on　a　robust　and　highly　accurate　large　involute　gear　measurement　standard　of　the　Physikalisch-Technische　Bundesanstalt　(PTB)　under　laboratory　conditions.　The　size　of　this　gear　measurement　standard　complies　with　those　gears　used　in　wind　power　plants.　The　external　gear　materializes　a　left　and　a　right　hand　gear　as　well　as　a　spur　gear.　The　obtained　results　of　profile,　helix　and　surface　measurements　are　presented.　These　research　activities　were　carried　out　at　the　PTB　in　the　department　of　coordinate　metrology.　(c)　2013　Published　by　Elsevier　Ltd.