Noob question... How to check account balance?

I'm working out my mining rig.. Been mining for about 12 hours..

I'd like to check my account balance to verify that transfers are happening to my account but I can't seem to figure out how to check the account balance.

I'm pool mining at ethpool if that makes any difference.
I did put my account ID in the config file and my bat file. So I know the account is attached to my mining instance.

So.. what is the way to check account balance?

Thanks.