KL-3385 pH stick The ph stick features an easy-to-read illuminated display, one-touch calibration, and Automatic Temperature Compensation (ATC). Main Features： 1.Fully waterproof 2.Auto turn on and off 3.Auto temperature compensation 4.No external knobs or switches 5.One-Touch Calibration System 6.Replaceable pH probe Technical Specification: Model KL-3385 Measuring range 2.1～10.8PH Accuracy ?.1PH Resolution 0.1PH Operating Temperature 0℃~50℃ Automatic Temperature Compensation 0℃~50℃ Batteries 3?.5V( AA Batteries) Dimensions 415mm x 23mm Weight 191g