Always wondered how fast I was recirculating the mash or running it out to the boil kettle but hadn't found a rotameter that claimed it could survive brewing temperatures. Found this Blichmann meter on Bobby's site and gave it a try. It's amazingly accurate even at just 1 quart per minute (my preferred runoff rate) and at 1/2, 1 and 2 gpm it's always within a margin of measurement error. Two thumbs up!