TDS-5 2 in 1 water quality tester is a portable handheld pen designed for daily household water detection. It can quickly test total dissolved solids and water temperature at the same time, meeting basic water quality inspection demands for drinking water, tap water, well water and aquarium water. It adopts high-precision sensor with stable test data, clear digital screen displays real-time readings directly. Built-in automatic temperature compensation function effectively reduces test errors caused by temperature changes. Mini lightweight body is easy to carry and store, with auto power-off function to save battery power. Simple one-button operation allows beginners to use without complicated steps. Widely used in home drinking water inspection, water purifier effect detection, swimming pool and hydroponic planting water monitoring. With reliable quality and affordable wholesale price, it is a cost-effective testing tool for global distributors.