Tan Delta Systems plc develops, manufactures, and sells oil sensors in the United Kingdom, Europe, and internationally. Its products include oil quality sensors, kits such as mobile oil test, display, sensor, and gateway kits, and accessories including gateways, display express units, gateway hubs, manifolds, and cables. The company also provides oil profiling services to industries such as bioenergy, power generation, mining and mineral, commercial marine, manufacturing, agriculture, utilities, and transportation. Incorporated in 2007, it is headquartered in Sheffield, the United Kingdom.