help with power supply

hello all...

recently i was working on getting a DC 5V power supply unit... but later i found that my cell phone adapter gives a DC output of 5V... i have a nokia model cell phone and adapter....

i need a help in this regard... i have a multimeter... however my adapter has a single output pin... if i want to check with my multimeter this output voltage of 5v, how should i check it?? i mean how must i connect this pin to my multimeter... wat abt ground? pls help...

Thanks in advance....

Does you 'single output pin' look like this?

yes.... this is how the pin looks....

One "wire" is the inside of the plug and the other "wire" is the outside. I am talking about the silver part. There is a black insulator between the inside and the outside.
Hope this helps.