Flow metering?

If I wanted to find the flow rate of either a gas/fluid what device should I use for the following:High flow rate metering of the flow of a liquid lik

If I wanted to find the flow rate of either a gas/fluid what device should I use for the following:
High flow rate metering of the flow of a liquid like a water or a refined oil?
Low flow rate metering of the flow of a liquid like a water or a refined oil?
High flow rate metering of a gas like air or natural gas?
Low flow rate metering of a gas like air or natural gas?

or:If I wanted to find the flow rate of either a gas/fluid what device should I use for the following:High flow rate metering of the flow of a liquid like a water or a refined oil?Low flow rate metering of the flow of a liquid like a water or a refined oil?High flow rate metering of a gas like air or natural gas?Low flow rate metering of a gas like air or natural gas?

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