All test equipment has to be calibrated. It is calibrated when it comes from the manufacturer but depending on how much the test equipment is used recalibration is usually recommended.
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Information and reviews of a fluke digital multimeters can be found at a website called eHam. Readers provide opinions and where they purchased their multimeters.
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A: The only calibration that a potentiometer is allow to do is on the resistance scale. The reason being is the internal battery looses capability with age so to compensate the pot. will change current available to make the ohmmeter to go to zero when the probes are shorted. To test a volts range then an accurate voltage must be used to verify calibration.
Most multimeters can be obtained at any good electronics store or hardware store. They generally retail for between 10 and 50 dollars depending on the features. If you want one for circuit testing on household wiring, just get the simplest possible. Otherwise you are wasting money for features you don't need.
Advantage 1. Different waveform upto mhz freq. Can be generated 2. it can be used to generate square, sine, triangular and sawtooth waveforms 3. calibration is internal. Disadvantage They are usually not suitable for applications that need low distortion or stable frequency signals.