Features: It would be more economical and convenient than purchasing it separately. Digital TDS meter has measurement range 0-9999ppm and ±2% accuracy, PH meter has measurement range 0.00- 14.00PH, 0.01PH accuracy and 0.01PH resolution. Digital ppm tester and ph tester both have the function of ATC-, the measuring data won’for t be influenced by the water temperature, no matter testing the ppm or ph of the water. Small size and low weight as a pen-, they are easy to be carried, and convenient for you to take it in your pocket when you go out. Suitable for checking the pH and water quality of drinking water, food, aquarium, swimming pools, hydroponics, laboratories, etc. Specifications: Material: ABS Size: approx 15.5x3.1cm/6.1x1.2in Measurement range: 0-14pH 0-990ppm Measurement accuracy: 0.01pH 1ppm Power supply voltage: 3V Resolution: 0.01 pH 1ppm Power supply: 2x1.5V(LR44 button battery) Package Includes: 1x PH Meter 1x TDS Meter 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.