I am currently in the market to buy a sound meter to calibrate my ht. I noticed alot of websites recommend an analog sound meter from radio shack which is no longer made. I have also found an analog craftsman sound meter which seems to be only available at Sears in the U.S. and not at its Canadian stores. Radio shack seem to still makes a digital sound meter. My question is do the digital sound meters work as well as the analog meters for calibration purposes?