... to humidity, resistance value adjustable. ProductionnameBC1 Adjustable Resistor,Variable Resistor,Wirewound ResistorsPower rating25W-3000WResistance value1Ω-10KΩResistance tolerance± ... Can provide the knob with customers requirement.Commonspecification25W,50W,100W,150W,300W,500W,1000W,1500W,2000W,2500W,3000W ect. ... dimension and packing .3. More details, please contact us. 100W Variable Rheostat(BCI)