Function of Zero Ohm Adjust Control?

The Zero Ohms Adjusting Knob on the Multi Tester Tool

The VOM (Volt-Ohm Meter) is type of measuring equipment used for reading the three major properties of electricity which are the Voltage, Current and Resistance. This tool typically has a huge rotating knob on the middle part which allows you to select the type of electrical property that you would like to measure. At the bottom part are the two probes differentiated with Red and Black color. The Red probe denotes the positive terminal while Black for the negative terminal.

Now, you might be wondering about the other smaller rotating knob just above the huge selector which is labeled as Zero Ohm. This adjusting knob only concerns about resistance. It doesn't have any effect when the primary selector is set for Voltage and Current.