Abstract: A fluid measuring device has two waveguides on a flow channel and a first and a second signal converter element mounted to the waveguides. The signal converter elements each comprise at least two signal converters for exciting surface acoustic waves in the waveguides that are arranged beside each other in a transverse direction of the flow channel. To determine a flow rate through the flow channel center signal data is measured with the center signal converters and side signal data is measured with the side signal converters of the first and second signal converter element. From the measured center and side signal data, a correction coefficient is determined and a flow rate is determined from the measured center and side signal data and the determined correction coefficient.

Abstract: The present invention relates to a ring assembly allowing a fast and accurate assembly in order to provide a ring, particularly a solitaire ring. Particularly, the present invention relates to a ring assembly (1), which can be assembled to provide a ring, comprising a bezel (2) and a ring body (3) having a seat (4) for said bezel (2), characterized in that said bezel (2) comprises a fixing portion (9a) being complementary to the seat (4) of said ring body (3) and an anchorage portion (9b) for a gem, wherein said anchorage portion (9b) changes according to the gem size, whereas said fixing portion (9a) and said seat (4) have a complementary, predetermined and unvariable configuration regardless of the size of said ring body (3) or said gem.