Features: It can be used for water quality testing in the field of domestic water and hydroponics. Its Electrode can measure conductive materials, such as suspended solids, heavy metals and conductive ions in water. This TDS Meter Probe is plug and play and easy to use. Also, the wide supply voltage of 3.3~5.5V and the analog signal. The TDS value can be used as one of the basis for reflecting the cleanliness of water. you can easily DIY a TDS detector, and easily check the cleanliness of the water to make your water quality better. Specifications: TDS Meter Sensor Module Input Voltage: 3.3~5.5V Output Signal: 0~2.3V Working Current: 3~6mA TDS Measurement Range: 0~1000ppm TDS Measurement Accuracy: ±10% F.S. (25 degrees Celsius) Size: Approx. 42 x 32mm / 1.7 x 1.3 in Module Interface: XH2.54-3P Electrode Interface: XH2.54-2P Waterproof TDS Sensor Probe Number of Needle: 2 Total Length: 60cm Connection Interface: XH2.54-2P Package size:5x5x3cm Package weight:24g Packing List: 1 x TDS Meter V1.0 Sensor Module 1 x TDS Probe 1 x Jumper Wire