A compact and convenient digital tool designed to quickly measure the overall water quality by detecting Total Dissolved Solids (TDS). TDS refers to the combined content of inorganic salts and organic matter present in water, including minerals, metals, and salts. With a simple press of a button, this meter provides an instant TDS reading displayed in parts per million (ppm) on a clear LCD screen. Lower TDS levels indicate purer water, with pure water registering at 0 ppm. This device is ideal for testing tap water, monitoring filtration system performance, and determining when to replace water filters. Please note that the meter does not detect biological contaminants. Suitable for a wide range of applications, including drinking water analysis, water filtration and purification systems, hydroponics (nutrient testing), aquariums, deionized (DI) water, swimming pools, spas, and various commercial and industrial uses. Built with durability in mind, the meter features a robust design and comes with a protective carrying case. It incorporates advanced microprocessor technology and an integrated digital thermometer for accurate and reliable measurements. Data is displayed clearly on an easy-to-read LCD screen, allowing for quick reading and recording. Measurement range: 0–9990 ppm Resolution: 1 ppm Accuracy: ±2% of reading Power supply: 2 x 1.5V (LR44 button battery), batteries not included Color: Black Material: Plastic Dimensions: 155 mm Package Contents: 1 x TDS Pen (Only the above items are included) Note: Lighting conditions and screen settings may cause slight variations in the displayed color of the product. Measurement error due to manual handling is within ±1–3 cm.