Resistance is measured in ohms, symbolized by the Greek letter omega (Ω) . It is typically measured using an instrument such as an analog multimeter or digital multimeter, which can also measure current, voltage, and other parameters. The primary tool for measuring resistance is the Ohmmeter, often integrated into a multimeter, and oscilloscopes and other testing equipment can also be used for more complex measurements. Resistance can be measured by applying a small voltage across the test leads and measuring the current flowing through, and then using Ohms Law to calculate the resistance. The measurement of resistance can be done using two methods: constant current or constant voltage. When measuring resistance, the test leads are inserted in the meter jacks, and the leads are then attached to the ends of whatever resistance is to be measured.