Hi!
I got a buzzer for my project and it was not labeled , Is there anyway I can find it? (preferably using multimeter)
Thanks in advance.
No. Not without gradually increasing the voltage until the magic smoke comes out of it.
Your concern may not be just the voltage but the frequency it has to be driven at, depending on the construction, for example, with the arduino tone library. Post a picture and/or any identifying markings.