This In-line Thermometer allows real time temperature monitoring. Use this handy gadget on the outlet of your counterblow or plate chilling system, to monitor exact temperature, of the flowing liquid. The large 3" dial thermometer gives an accurate real-time reading. Our Homebrew Stuff thermometer is designed to be an effective instrument in the beer brewing process. You may notice that the temperature range has been reduced from a typical 0°-250° to a reduced range of 50°-220°, this reduced temperature range makes the thermometer more accurate, and the temperatures easier to read. There is a calibration screw on the back so that the thermometer can be boil calibrated for the most accurate mashing temps.