What reading on a DMM indicates that a N.O limit switch was working correctly?

A reading of 0 Voltage on a Digital Multimeter (DMM) indicates that a Normally Open (N.O) limit switch is functioning correctly in an application where the switch is not activated. When the N.O limit switch is not closed, there should be no electrical current flowing through the circuit, and therefore the DMM will register 0 Volts. This means that the circuit remains open, preventing electricity from passing through, which is the expected behavior of a Normally Open switch when it is not engaged.

In contrast, a reading of 5 Volts or 12 Volts would indicate that current is flowing through the circuit, which would occur if the switch had been activated, contradicting the definition of a Normally Open switch in its resting state. High resistance would suggest that there is a break in the circuit or that the switch is not functioning properly, as a functioning N.O switch in its off position should display a very low or zero resistance. Therefore, 0 Voltage is the correct reading indicating that the N.O limit switch is working as intended when it is not activated.