Features: 1. Wide voltage operation: 3.3~5.5V. 2. 0~2.3V analog signal output, compatible with 5V, 3.3V two control systems. 3. The stimulation source is an AC signal which effectively prevents lead polarization. 4. Waterproof probe for long-lasting immersion in water 5. Arduino compatible, easy to connect, plug and play, no soldering required. Technical specifications: Signal adapter board: Voltage of input: 3.3~5.5V. Output signal: 0~2.3V. Operating current: 3~6mA. TDS measurement range: 0 ~ 1000 ppm. TDS measurement accuracy: 10% FS (25C). Dimensions: 42 x 32 mm. Module interface: XH2.54-3P Electrode interface: XH2.54-2P TDS probe: Number of probes: 2 Total length: 83 cm. Connection interface: XH2.54-2P Color: white. Other: waterproof probe. This device can be used to measure general household water quality. The Arduino compatible TDS sensor is used to measure the TDS value of water. Premium product TDS value can reflect the purity of water and be used for water quality testing in the fields of e drinking water and hydroponics.