Features 5-in-1 Water Quality Tester: It is a multifunctional water quality pen that can measure ph, TDS, ec, salinity and temperature. All-round measurement of water quality to ensure healthy water quality. Portable: Lightweight and portable design, pen-style design is convenient for indoor and outdoor use. Features automatic temperature compensation to ensure readings are always accurate over a wide range of temperatures. Accurate and Reliable: Made of high-quality materials, efficient and accurate. Features high performance, pen-style design, fast numerical stability and accurate calculation results. Easy to Read: Large and clear display, easy to read the displayed value, the auto-lock function is easier to use. The one-button lock reading feature helps lock readings even when the pH meter is removed from the sample! Widely Used: Suitable for garden, home, laboratory, farm, aquarium, etc. Whether filters need to be replaced, maintenance of aquariums, hydroponics (testing nutrients), swimming pools and spas, etc. Specification: Item Type: Digital PH Meter Material: Plastic Color: As shown in the picture Battery: 3 x LR44 button battery (Not included) Conductivity Test Range: 0 to10000uS/cm 10.01-19.99ms 20.1-400mS/cm Resolution: 1uS/cm; 0.1mS/cm Accuracy: ±2% of reading TDS Test Range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0ppt Resolution: 1ppm; 0.1ppt Accuracy: ±2% of reading Salinity Measurement Range: 0.00 to 25.00% Resolution: 0.01% Accuracy: 0.01-5.00% (±0.1%) 5.10-25.00% (±1%) pH Test Range: 0.01-14.00pH Resolution: 0.01pH Accuracy: ±0.05pH Temperature Compensation: Automatic temperature compensation (ATC) Working Environment: 0 to 60.0 ° C (32.0-140 ° F); RH 100% TDS Factor: 0. 4to 1.0 Temperature Range: 0.1-60.0 °C/ 32.0-140 °F Temperature Accuracy: ±0.5 °C Temperature Resolution: 0.1 °C / °F Auto Power Off: 5 minutes Display Screen Size: Approx.33x24mm / 1.3x0.9in Size: Approx.183x37x37mm / 7.2x1.5x1.5in) Weight: Approx.90g/3.2oz Display: No backlight support Waterproof Rating: IP67 Power Consumption: 2.9mA, power consumption for shutdown is 0 Accuracy within 150ppt is relatively accurate, and deviations above 160ppt are large Package List: 1 x PH Meter1 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. 3. Be sure to clean the electrodes after each use. 4. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List 1 x PH Meter 1 x Instruction Manual