Abstract: A method for quickly and precisely on-field locating and relocating a measurement instrument arrangement, characterized in that said method comprises the steps of: assembling, in a laboratory, said instrument arrangement to an intermediate system thereby providing an instrument arrangement—intermediate system assembly; transporting said instrument arrangement—intermediate system assembly to an installation site; coupling said instrument arrangement—intermediate system assembly to a pedestal by firmly connecting said intermediate system to said pedestal; disconnecting, after use, said instrument arrangement from said intermediate system while leaving said intermediate system coupled to said pedestal; and on-field using again said instrument arrangement by removably reconnecting said instrument arrangement to said intermediate system.