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 the press of a button, this meter provides an instant reading displayed in parts per million (ppm). Lower TDS levels indicate purer water, with distilled or purified water typically reading at or near 0 ppm. This device is ideal for testing tap water quality and determining when water filter replacements are needed. Please note that the meter does not detect biological contaminants. Suitable for a wide range of applications, including drinking water assessment, water filtration systems, hydroponics (nutrient solution testing), aquariums, reverse osmosis, deionized water (DI), swimming pools, spas, and various commercial and industrial uses. The meter features a durable, handheld design and comes with a protective carrying case for added portability and safety. Equipped with advanced microprocessor technology and a built-in digital thermometer, the device ensures accurate and reliable measurements with efficient data display. The easy-to-read LCD screen allows for clear visibility of results. Designed for user convenience, it supports quick testing and recording of water quality data. 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 Meter 1 x Protective Case with Belt Clip Note: The product image may slightly vary in color due to lighting and screen settings. Measurement tolerances may vary by ±1–3 cm.