Features:Portable: The water quality test pen is small and lightweight, making it easy to carry and use anywhere.Battery-powered: Operates on batteries, ensuring convenience and eliminating the need for external power sources.Accurates: Provides precise measurements of Total Dissolved Solideds in water, allowing users to assess water quality effectively.Easy to use: Simple operation with intuitive controls, suitable for both professionals and everyday users.Versatile: Ideal for testing various water sources, including tap water, well water, and aquariums, providing valuable insights into water puritys.Notice:1.Actual color may be slightly different from the image due to different light effect2.Please allow 1-3cm deviation due to manual measurementDescription:Material: ABSSize: 155*31*23mmBattery: 2 * LR44 Button Battery(Not Included)Measurement range: 0-9999ppmError: 2%