Set of 2 Global 0.05 PH High Accuracy Compact Size Meter Tester With ATC (Automatic Temperature Compensation) LCD Screen and TDS Digital Meter (pH+TDS) Easy to Use - With simple to follow instructions, the meters can be used straight out of the box Pocket-Sized - Uses two 1.5V 357A button cells, weighs 1.8oz, and comes with a carrying case Accurate Measurements - Range of 0.00 to 14.00 pH, with a 0.01 pH resolution and 0.05 pH accuracy Great Value in a Two-Pack - The products can be used at home, in schools, in offices, or outdoor 12 Month Warranty - If you run into any issues, we will be more than happy to help!