Portable LCD TDS Water Quality Purity Monitor Aquarium Pool Hydroponic Water Tester Meter Features:&nbsp; Adopts premium ABS material,eco-friendly, corrosion resistant and durable. Hold function: Saves measurements for convenient reading and recording. Large LCD screen is waterproof, clearly displays the measuring data, easy to read. Auto temperature compensation function, covert to a DTS value at water temperature of 25°C. When not in use for about 10 minutes, it will automatically power off, which&nbsp;saves&nbsp;battery energy. Applied in water laboratory, aquaculture, swimming pool, aquarium, water quality testing and monitoring. <br style="white-space:normal;" /> How e: 1. Remove the pen cap and turn on the ON switch.&nbsp; 2. The pen shall be put into the test solution, and the height of the solution shall not exceed 2 cm;&nbsp; 3. Dry the pen point after the application is finished.&nbsp; Precautions: Avoid soaking the TDS pen in the water, avoid direct light and high temperature, and avoid the impact of the weight and fall&nbsp;<br style="white-space:normal;" /> Specification: Condition: <br style="white-space:normal;" /> Material: ABS<br style="white-space:normal;" /> Color: White<br style="white-space:normal;" /> Range: 0-9990ppm<br style="white-space:normal;" /> Resolution: 1ppm(0-9990ppm), 10ppm(1000-9990ppm)<br style="white-space:normal;" /> Test Accuracy: ±2% Full Scale<br style="white-space:normal;" /> Working Temperature: 0°C-50°C<br style="white-space:normal;" /> Battery Type: 2. 1.5V Button Cell Batteries(not included)<br style="white-space:normal;" /> Size: approx. 14.3*2.4*1.4cm/5.63*0.94*0.55in<br style="white-space:normal;" /> Weight: approx. 50g/1.76oz<br style="white-space:normal;" /> Package List: 1 * Water Quality Tester(Battery Not Included) Note: 1. Please allow 1-3cm error due to manual measurement, thanks for your understanding.<br style="white-space:normal;" /> 2. Monitors are not calibrated same, item color displayed in photos displayed in photos may be showing slightly different from the real object, please take the real one as standard.