The Milwaukee pH56 pH/Temp Meter is a must - have for all - grain brewers. When you're brewing your own beer, getting the right water pH is key to a great - tasting brew. This meter is easy to use, with features like automatic calibration and temperature correction. It has a wide range of - 2 to 16 pH and can measure temperatures from 23° to 140°F. The large digital display makes it easy to read the results. The batteries last for about 300 hours, and it comes with calibration solution sachets. Just make sure to take care of the electrodes by rinsing them after use and storing them in the storage solution.