SINOWELL HYDROPONICS: HI-GRADE QUALITY, THE MOST COMPETITIVE PRICE, BETTER SERVICE, YOUR BEST HYDROPONICS SUPPLIER IN CHINA ph meter, ph tester-Range: 0-100CF; 0.0-10.0EC; 10-9990ppm -Resolution: 1CF; 0.1EC; 10ppm -Accuracy: ±2% FS -Calibration: One point at 6.7 EC EC/CF/PPM Meter