A flow counter capable of correctly checking an operating state of the flow counter and leakage and correctly indicating a total amount of flow by allowing the rotation of a pointer to be learned accurately in the form of numerical data. 0 mol % of repeating units derived from at least one multiolefin monomer, and a gel content of less than 5. The technique may be used to generate multiple accurate and process independent current sources. The apparatus may also include a global positioning system receiver.