1. Different composition structures:

A megohmmeter consists of medium to large scale integrated circuits. This meter has a high output power, high short-circuit current value, and multiple output voltage levels (each model has four voltage levels).

2. The working principle is different:

3. Different scope of use:

The general definition is that 80 ohms or less is conduction, otherwise it is non conduction. That is to say, connect the red and black probes of the multimeter on both sides of a circuit. If the resistance value of this circuit is less than 80 ohms, the multimeter will make a sound and believe that this circuit is conductive.