The SR1-1M Standard Resistor is a 1 Megohm model of the SR1 family. SR1 resistors are designed to be accurate, stable working standards. The SR1 features binding posts on the top and removable banana plugs on the bottom. The SR1 features a unifilar winding on a flat mica card to minimize both series inductance and shunt capacitance. These connections facilitate 2-wire or 4-wire use. A durable aluminum case provides electrostatic shielding.