*LCD Digital TDS Pen Meter Test Quality Water Purity Tester Specifications: Measurement range: TDS:0-9990ppm; Degrees Celsius: 0.1-80.0 Celsius; Fahrenheit: 32.0-176.0 Accuracy: ±2% Size: 138mm * 23mm * 14mm Color: White *Digital PH Meter Tester Hydroponics Water Test Pen Water Quality Tester Specifications: Material: ABS plastic Electrode: glass bulb Color: yellow+black Measure range: 0.00-14.00pH Resolution: 0.01pH Accuracy: ±0.05 pH Working temperature: 0-80(°C) Power supply(include): 2 x AG13 Button batteries(Keep using more than 500 hours) Size: about 155mm*31mm*18mm Calibration: two points automatic calibration