I'm going to take my cheap Milwaukee ph600 for a test run this weekend on a stout. I think I'll make some light mineral additions to the mash right off the bat, 2g CaCl and 2g chalk, based on my home water profile and then see what the pH looks like. I'll just shoot for the 5.5 room temperature reading and see where I end up. If I need to raise the pH more I'm going to add equal proportions of both the salts in 2g increments until I get there.