FCSL Metal Foil Current Sense Resistors Ohmite FCSL Series Metal Foil Current Sense Resistors incorporates proven metal foil technology to produce the ultimate in a current sense resistor.. Ohmite offers the FCSL Series Metal Foil Current Sense Resistors which combine very low and stable TCRs in a wide selection of very low ohmic values. Power ratings up to 10W make Ohmite's FCSL series the ideal choice for your current sensing applications.