2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/208532A limitation on simultaneous measurement of two arbitrary positive operator valued measures is discussed. In general, simultaneous measurement of two noncommutative observables is only approximately possible. Following Werner's formulation, we introduce a distance between observables to quantify an accuracy of measurement. We derive an inequality that relates the achievable accuracy with noncommutativity between two observables. As a byproduct a necessary condition for two positive operator valued measures to be simultaneously measurable is obtained.7 pages, 1 figure. To appear in Phys. Rev. AQuantum Physicstext