Use this Milwaukee pH55 pH/Temp Meter when you're brewing all - grain beer. It's perfect for all - grain brewers who want to ensure the quality of their brew. The meter has a pH range from - 2 to 16 and a temperature range from 32° to 122°F, with 0.1°F resolution and good accuracy. It comes with useful features like automatic calibration and temperature correction. It's powered by 1.5V batteries that can last about 300 hours. Make sure to follow the care instructions for the electrodes to keep it working well.