I have a Denon AVR-4802 reciever on order and will arrive on wensday. Want to have everything ready to go when it gets here. Going down to Radio shack tommorrow to get the meter. Whats the meters model # that everyone uses here?? Also which calibration disc should I get that works best with my new reciever?? And where do I purchase this disc?? Best buy? Circuit city?? etc..