Electrical conductivity meter Electrical conductivity meter An electrical conductivity meter (EC meter) measures the electrical conductivity in a solution. It is commonly used in hydroponics, aquaculture, aquaponics, and freshwater systems to monitor the amount of nutrients, salts or impurities in the water. The common laboratory conductivity meters employ a potentiometric method and four electrodes. Often, the electrodes are cylindrical and arranged concentrically. The electrodes are usually made of platinum metal. An alternating current is applied to the outer pair of the electrodes. The potential between the inner pair is measured. Conductivity could in principle be determined using the distance between the electrodes and
Jim Measures Hull Kingston Rovers in the 1964 Challenge Cup Final during the 1963–64 season at Wembley Stadium, London on Saturday 9 May 1964, in front of a crowd of 84,488. Jim Measures is the father of rugby league of the 1990s for St. Helens Colts, and A-Team, Leigh and Widnes Vikings; Neil Measures. Jim Measures James Measures (born 14 April 1939), also known by the nickname of "Jim", is an English former professional rugby league footballer who played in the 1950s and 1960s. He played at representative level for Great Britain, and at club level for St Helens, Widnes and the