Feature:1. It is a multi-functional water quality pen that can measure ph, TDS, ec, salinity and temperature.2. With high performance, pen design, fast numerical stability and accurate calculation results.3. Lightweight and portable design, convenient for indoor and outdoor use.4. Made of quality material, highly efficient and accurate.5. Large and clear display screen, easy to read the displayed value.6. Applicable for garden, home, laboratory, farm, aquarium, etc.7. It has automatic temperature compensation function.Specification:Condition: 100% Brand NewItem Type: Digital PH MeterMaterial: PlasticColor: As shown in the pictureBattery: 3 x LR44 button battery (Not included)Conductivity Test Range: 0 to10000uS/cm 10.01-19.99ms 20.1-400mS/cmResolution: 1uS/cm; 0.1mS/cmAccuracy: ±2% of readingTDS Test Range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0pptResolution: 1ppm; 0.1pptAccuracy: ±2% of readingSalinity 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: 0.01-14.00pHResolution: 0.01pHAccuracy: ±0.05pHTemperature Compensation: Automatic temperature compensation (ATC)Working Environment: 0 to 60.0 ° C (32.0-140 ° F); RH 100%TDS Factor: 0. 4to 1.0Temperature Range: 0.1-60.0 °C/ 32.0-140 °FTemperature Accuracy: ±0.5 °CTemperature Resolution: 0.1 °C / °FAuto Power Off: 5 minutesDisplay Screen Size: Approx.33x24mm / 1.3x0.9inSize: Approx.183x37x37mm / 7.2x1.5x1.5in)Weight: Approx.90g/3.2ozDisplay: No backlight supportWaterproof Rating: IP67Power Consumption: 2.9mA, power consumption for shutdown is 0Accuracy within 150ppt is relatively accurate, and deviations above 160ppt are largePackage List:1 x PH Meter1 x Instruction ManualNote: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. 5.Product needs to be calibrated before use (calibration powder is not included).