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The flow in a floating element flow meter (rotameter) was studied with laser Doppler anemometry (LDA) and computational fluid dynamics (CFD). With the help of refractive index matching to eliminate optical distortion by the flow tube, the laser Doppler anemometer permitted non-intrusive velocity measurements in all regions of the flow including the immediate vicinity of the float. The computational investigation allowed an insight to the flow structure, particularly with respect to the strong velocity gradients in the gap around the float and the recirculation zone above the float. Results were obtained for various flow rates, different densities of the float material and two heights of the float in the tube. (Author).