A compact and convenient digital tool designed to quickly measure water quality by detecting Total Dissolved Solids (TDS). TDS refers to the combined amount of inorganic salts, metals, and minerals present in water. With the press of a button, this meter provides an instant TDS reading displayed in parts per million (ppm) on an easy-to-read LCD screen. Lower TDS levels indicate purer water, with distilled or pure water measuring close to 0 ppm. This TDS meter is ideal for testing tap water quality, monitoring filtration systems, and determining when to replace water filters. Please note that it does not detect biological contaminants such as bacteria or viruses. Suitable for a wide range of applications including drinking water assessment, water filtration and purification systems, hydroponics (nutrient solution testing), aquariums, reverse osmosis, deionized (DI) water systems, swimming pools, spas, and various commercial and industrial uses. The device features a durable, handheld design with a protective carrying case and includes a belt clip for convenient storage. Equipped with advanced microprocessor technology and a built-in digital thermometer, it ensures accurate and reliable measurements. Data is displayed clearly on an easy-to-read LCD screen for quick interpretation. Measurement Range: 0–9990 ppm Resolution: 1 ppm Accuracy: ±2% of reading Power Supply: 2 x 1.5V LR44 button cell batteries (not included) Color: Black Material: Plastic Dimensions: 155 mm Package Contents: 1 x TDS Pen Tester Protective Carrying Case Note: Lighting conditions and screen settings may cause slight variations in the appearance of the product color. Measurement tolerances may vary by ±1–3 cm.