Sensor technology firm Halma has paid £3m in cash for the water technology division of Wagtech International.The UK firm will merge the earnings enhancing acquisition with its Gateshead-based water analysis business Palintest. "Wagtech water technology division's range of water and environmental testing products fits closely with Palintest's existing activities and increases its presence within developing regions such as Africa and Asia where Wagtech has strong brand recognition," Halma boss Andrew Williams said.