Separate pH and TDS electrode, precise measurement. Can online monitor for a long time. Apply in water sources, aquarium, hydroponics, spas, swimming pools and other water systems. Automatic temperature compensation. Use to measure the pH / TDS of solution,Easy calibration of pH and TDS with just a mini-screwdriver.(Screwdriver not included) Large and clear LCD with backlight, easy to read and accurately measuring functions. Range: pH: 0.00 - 14.00pH TDS: 0.00 - 1999PPM/cm Temperature Compensation: 0C - 50C Working temperature: 0C - 50C Power supply: DC 6V (Power-supply Adaptor) Battery: 1.5V -13 Button Cell Batteries (NOT Included!!) Voltage: AC220V Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Color: Blue & Black Material: ABS Package Contents: 1set x PH 2-in-1 testing inst ents Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.