The use of the automotive multimeter is very simple, you must start by having solid foundations and surely any multimeter will be very useful.
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Electronic multimeters have several functions or parameters that they can measure that are grouped together.
The basic and common use of the multimeter is as a VOLTMETER.
Then it can be used as a Resistance Meter or ohmmeter.
A third common use but more careful in terms of connection is the use of the AMMETER or CURRENT METER.
With these three magnitudes you can understand how a multimeter works and use it without fear, with all the precision of a Professional.
There are a variety of multimeters, MANUAL selection, autoranging, specialized or oriented to certain areas: AUTOMOTIVE, INDUSTRIAL, CHEMICAL, SENSORS, ETC, but in the end they all have the same FOUNDATION and utility.