the valve 114 causes the two liquids a b to be forced in sequence into and through the zigzag mixing channel 108 the liquids then become intermixed and are advanced in the third measurement channel up to the wall section 134 which is farthest from the mixing channel fig7 the mixed liquid ab is then measured out wherewith the excess amount of liquid disposed upstream of the wall section 130 which is closest to the valve 114 is drawn off by application of a pressure difference between the gas conduit above the second wall section 130 and the gas conduit above the wall section 124 of the second measurement channel which section is distal from the valve 114 the second measurement channel 106 now serves to hold the waste liquid in a next step fig9 the precisely measured amount of liquid ab disposed between the second wall section 130 closest to the valve 114 and the first middle wall section 132 next farther from the valve 114 is transported toward the withdrawal conduit 112 for further use inside or outside the microfluidic chip this is done by establishing a pressure difference between the gas conduit over the wall section 132 and the interior pressure of the conduit 112 finally.