The Arduino-Compatible TDS Sensor / Meter Kit is designed to measure Total Dissolved Solids (TDS) in water for water-quality monitoring applications. It supports a 0–1000 ppm measurement range and provides a 0–2.3 V analog output compatible with 3.3 V and 5 V controllers. The kit features a waterproof probe and AC excitation for improved measurement stability. It is ideal for Arduino, hydroponics, domestic water testing, IoT, and DIY water-quality monitoring projects.