SMART SENSOR AR8011 Water Quality Tester TDS Analyzer Meter with LCD Screen Features: Made of high-quality materials, it is durable and practical. With LCD high-definition display and backlight function, it can easily cope with the night environment. Large capacity button battery with built-in 4 LR44 1.5V button battery for durability and easy replacement. The probe is replaceable and easy to replace and easy e. Ergonomically designed for non-slip design on both sides of the product. This product has high precision and stable operation. It can measure the pH value of the solution and display the temperature of the liquid to be tested. It is widely used in industries, wastewater, agriculture, medicine, food, scientific research and environmental protection. Specifications: Condition: Material: Plastic Conductivity measuring range:  0μS-1999μS 2.00mS~19.99ms TDS measuring range 0ppm~1999ppm 0ppt~19.99ppt Conductivity/TDS measurement error: ±3NFS±1digit Instrument Repeatability: 1μs/0.01mS Solvent temperature compensation range: 0℃~60℃ Temperature accuracy: ±1℃ Power Supply: Lr44 button type battery * 4 (Battery not included) Display: Large LCD segment type display Working temperature range: 0℃~50℃ Size: approx. 75*55*28mm / 3*2.2*1.1in Package list: 1 * Water Quality Tester (Battery not included) 1 * Instruction Manual