What are the uses and functions of a multi-tester?

Answer 1

Call a qualified electrician.

If you are wanting to test a power circuit (120/240) at your home, there is no way to teach you on-line all the electrical safety (NFPA 70E) that you would need to know to use a multi-tester safely!

Electricity is DANGEROUS!!

Call a qualified electrician.

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Read the instruction manual!

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Depends on what you're using it for, to read voltage supply SWITCH ON meter, set it to volts (600volts for testing on for 230/400v supply) (200v for anything below) place red lead to live and black lead to neutral, to check continuity set it to ohms....actually to be honest im not going to go much further with answer, because you shouldn't really be near electricity if you had to ask that question!!!!!!!!!!!!!

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
If you do this work yourself, always turn off the power
at the breaker box/fuse panel BEFORE you attempt to do any work AND
always use an electrician's test meter having metal-tipped probes
(not a simple proximity voltage indicator)
to insure the circuit is, in fact, de-energized.

Answer 2

Simple logic in checking faulty devices and broken electronic component are:

1: Set the multitester into ohms.

2: Put the two leads of the multitester or "multimeter" at each end of the part you want to test.

3: Read the readings. If the readings is 0hms that device is fine, it if shows and infinite numbers of keep on changing, it needs replacement.