Features: EZ9901 Water quality test pen accurately detects , TDS and temperature to ensure safe and reliable water quality. backlight display for easy night use; With battery, ready-to-use, portable design, easy to carry. Suitable for home users, outdoor enthusiasts, Aquariums keep and laboratory technicians. It can be used for home drinking water testing, outdoor camping, fish tank water quality monitoring and laboratory research. Produced of quality plastic for long service. Specifications: Material: plastic Length: about 183mm/7.2inch Styles: 2 for option ranges: 0.01 to 14.00 TDS ranges: 0 to 1000ppm Temperature: 0.1 to 60℃ Styles: 2 for option Package Includes: 1xWater Quality Meter note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.