Elesa has announced that its high-quality visual flow indicators may now be specified as flow measurement devices with the addition of an external PLC compatible sensor and impellor mounted activating clips. This quickly adapts these units from passive indicators of flow as protection against blockages for example into active measurement equipment as part of the adjusting and updating of hydraulic system performance. The new metering indicators are available in inch and 1inch sizes to suit many applications in fluid systems throughout industry where cooling or liquid transfer systems are employed. This will include process or manufacturing plant, for example, for water, oil, petrochemical and hygienic area systems.