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How can one calibrate a multimeter, like a UT61E or any other multimeter in the 50 ~200 $ pricemark, when one does NOT have an expensive FLUKE nor a friend who has a FLUKE)

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Very generally and at the most basic, you need a precision voltage reference and resistors. Obtaining 0.1% is fairly easy, for resistors it's straightforward, and for voltage references look up "precision voltage reference" (something like this), and bias it with 0.1 to 1 mA.

The actual calibration procedure will vary from meter to meter, so you will need to dig up the appropriate documents.

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Basically, there are lots of adjustable resistors on the multimeter PCB - don't forget to mark original positions of all of them before you start.

You ether get a precision resistor references (read datasheet on temperature coefficient), or find a guy with precision equipment in your city to compare the readings.

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