Features:1. Easy to read: The large screen displays the test result at pH and chlorine levels for easy and accurate reading.2. Water balance: The water balance must be correct or it will affect the skin and eyes. PH should be neither too acidic nor basic to feel comfortable.3. Application: easy to operate, you can quickly check whether the chlorine and PH are in the ideal range. Specially designed for a family pool or spa. Description: Ideal for simple water and CL2 PH testing operations, without any chemicals or no labor. It doesn't require too many steps. Specifications:Host: 190*120mmProbe Length with Handle: 150mmProbe Length: 48mm Cable Length: 130mm Power Supply: 1 * 1.5V AA Alkaline Battery (Not Included)Measuring Range: 7.2-7.8phPackage Included:1 * Probe Tester (Without Battery)1 * User ManualNotes:1. Please allow 0-1 inch error due to manual measurement. Thank you for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object.