Our Digital Pen Type TDS (Total Dissolved Solids) Metre is a small and precise device for measuring the concentration of dissolved solids in water. This portable equipment is perfect for a variety of tasks such as water quality testing, aquarium maintenance, hydroponics, and beverage production. It gives critical data for determining water purity and assuring the safety of water for diverse applications. TDS readings are shown on a clear and easy-to-read LCD screen in parts per million (ppm) or milligrammes per litre (mg/L). The pen-style shape is compact and lightweight, allowing for simple travel and storage in pockets or toolkits.