Feature: 1. Water quality tester has a sensitive probe, can avoid interference, reduce the magnetic field in the water, and reduce errors. 2. The instrument has 4 different modes, press SHIFT key to switch between different modes. 3. Widely used in drinking water, aquarium, fish tanks, swimming pools, farmland irrigation, laboratories. 4. Compact and portable pen type design,easy to operate and storage, convenient to carry. 5. The large LCD screen, TDS, EC temperature display is clear, easy to read. Specification: Condition: 100% Brand New Item Type: Water Quality Tester Material: ABS Color: Blue Size: Approx.154x30x14mm/6.1x1.2x0.6in Weight: Approx.65g/2.3oz Application: Swimming pool, water plant laboratory, aquaculture industry Measurement Accuracy: 0.1 Resolution: 0.1 Measuring Range: 0-9990us/cm Battery: 1 x CR2032 button battery 120MAH(Not included) . Package List: 1 x Water Quality Tester(Battery Not Included)1 x Storage Bag1 x Instruction Manual Note: 1. Please allow 1‑2cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.