Variable Resistor, 100pcs Values 500ohm-1M ohm Film Variable Resistor Potentiometer Rheostat Trimpot Assortment Kit for Various Projects 10pcs Each Type Blue and White: Amazon.com: Industrial & Scientific
25W 5 OHM High Power Wirewound Potentiometer, Variable Resistor,Rheostat, 25 Watts.: Amazon.com: Industrial & Scientific