Features: 1It is widely used in industry agriculture food medicine scientific research environmental protection and other fields. 2The water quality test pen is small and smart easy to carry easy to operate and practical. 3The water quality test pen can test the purity of water quality such as whether there are heavy metals etc. 4The higher the electrical conductivity the more impurities in the water quality which is not pure enough. 5The water quality test pen provides accurate water quality testing which is safer and healthier. Specification: Item Type: Water Quality Test PenMaterial: Plastic + ElectronicsProduct Size: Approx. 18.5 x 3.7 x 3.7cm/7.3 x 1.5 x 1.5inWeight: Approx. 158g/5.6ozBattery Parameters: Built-in 3 x LR44 Button BatteriesBattery Type: Button BatteryBattery Model: LR44Nominal Battery Capacity: 160mAhTemperature Measurement Range: 0-60 resolution 0.1PH Measurement Range: 1-14 resolution 0.01PHTDS Measurement Range: 0-9999ppmAutomatic Shutdown: 5 Minutes Package List: 1 x Water Quality Test Pen1 x English Instruction Note: 1. Please allow 0‑2 cm 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.