Feature: 1. It is used to quickly and professionally test the water quality of pH, EC (conductivity), TDS (Ppm), salinity (Ppt) and temperature. 2. With automatic calibration and 0 to 60˚C automatic temperature compensation function, 0.01 PH, 1%F.S, 0.5˚C accuracy, ‑2.00 to 16.00 PH & 0‑20.00ms/cm measurement range. 3. Automatic recognition and stable measurement values ​​save the trouble of guessing when to perform the measurement manually (automatic), and the existing functions can be maintained. 4. The water quality test pen can meet your different needs. Intelligent self‑diagnosis function, it will give prompts for measurement beyond the range and incorrect calibration; IP 67 waterproof and dustproof. 5. With a large and clear LCD diplay with backlight, the value can be easily read and accurately calibrated under low light conditions. Specification: Item Type: Water Quality Test Pen Model: EZ-9909SP Material: ABS Battery: 3 x 1.5V LR44 (Battery Not Included) Uses: Aquarium, aquaculture, soilless culture, swimming pool and hot springs, school laboratories, chemical, food or beverage manufacturing, textile printing and dyeing, paper or pulp bleaching, printing, cooling towers, boilers, cleaning or sewage treatment, etc. Basic parameters: PH: range: 0.00-14.00pH, accuracy: 0.01pH, resolution: ±0.05pH EC: Range: 0-10000μS/cm, 10.1-19.99mS. 20.1-400.0mS/cm, accuracy: 1μS/cm; 0.1mS/cm, resolution: ±2%F.S TDS: Range: 0-10000ppm, 10.1-200.0ppm, accuracy: 1ppm; 0.1ppt, resolution: ±2%F.S Salinity: range: 0.01%-25.00% 0-10000ppm, 10.1-200.0ppt, accuracy: 1ppm; 0.1ppt; 0.01%, Resolution: 0.01%-5.00% (±0.1%) 5.1%-25% (±1 )±2%FS Temperature: range: 0-60℃/32-140℉, accuracy: 1℃/℉, resolution: ±0.5℃ Automatic Temperature Compensation: 0-60℃ Automatic Shutdown: automatic shutdown after 5 minutes of no operation. Package List: 1 x Water Quality Test Pen (Battery Not Included)3 x PH Powder1 x Manual