The Milwaukee MW105 MAX Waterproof 3-in-1 pH/OPR/Temp. meter has won fans around the world with its reliable, fast and simple operation as well as its toughness and IP67 Waterproof rating. Accurate to ± 0.02 pH with automatic or manual temperature compensation and built in GLP key. Ideal for use by brewers, wine makers, growers, labs, food processing, water treatment and many other applications with challenging pH measurement needs.