Features: High sensitivity probe for more accurate measurement. Testing PH/ EC/ TDS/ SALT/ S.G/ Temperature, short press the MODE button for easy switching. Temperature unit switchable: / . Digital screen with backlight, greatly enhances reading experience, 3 LR44 batteries powered (not included), auto shutdown to save power. Rotate to remove the protective cap, immerse the electrode into the testing solution. Suitable for aquarium, swimming pool, hydroponics, lab, etc. Specifications: Material: Plastic Size: approx 180X45X45mm/7.1X2X2 PH range: 0.00-14.00PH Accuracy: 0.01ph Resolution: 0.03PH Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Water Quality Tester