It is important to know how to properly hook-up, calibrate, and select the appropriate measuring field. Making a reading on an inappropriate measuring field will give an erroneous value of data.
Two types of measuring devices are available, analog and digital.
Analog measuring devices use a spring-mounted needle and a magnetic field to indicate a value on the measuring scale of the device. The value shown is the result of a comparison between the circuit or its components and a known value imbedded in the device.
The digital measuring devices show a numerical value of the measurement. They are very sensitive electronic devices that control both classic electrical circuits and electronic circuits.