The present invention provides an apparatus and method for measuring nonferrous electrical resistance measurement. A pattern of a plurality of electrodes are arranged on the substrate containing the 1-D conductive elements and a plurality of electrical property measurements are performed in a plurality of different directions between the plurality of electrodes. The pump unit conveys the wetting agent through the conveyor pipe to the nozzle with the wetting agent flowing through an exchangeable throttle that determines the shape and size of the free jet of the wetting agent. The physical refining removes the free fatty acid by heating the recovered vegetable oil and the animal fats and pulling vacuum to allow separation of boiling points between the oil of the feedstocks and the free fatty acids. The light may be modulated in accordance with a modulation technique referred to as frequency shift on-off keying. A perfusion kit includes a perfusion chamber apt to contain a graft to be perfused with a liquid and a transfer chamber apt to contain a liquid to be perfused, the perfusion chamber being connectable in a tight manner with the transfer chamber for allowing a fluid exchange between the two chambers and inhibiting a fluid exchange between the two chambers and the external environment.