Clean fluid, low-viscousViscous fluid, possibly resulting in a low Reynolds NumberSolids suspended in the fluidAbrasive material in the fluidCorrosive fluidGas in liquid or liquid in gasLow pressure drop (or high recovery) requiredLow accuracy (2%+) is acceptableHigh accuracy is required (1% or better)Low flow ratesMedium flow ratesHigh flow ratesHigh rangeability required(>5 to 1)Straight run length needed?