Fangrui Product Details 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 Excitation Source Is An Ac Signal, Effectively Preventing Probe Polarization 4. Waterproof Probe For Long-term Immersion In Water 5. Compatible, Easy To Connect, Plug And Play, No Soldering Required Input Voltage: 3.3~5.5v Output Signal: 0~2.3v Working Current: 3~6ma Tds Measurement Range: 0~1000ppm Tds Measurement Accuracy: F.s. (25celsius) Module Interface: Xh2.54-3p Electrode Interface: Xh2.54-2p Number Of Probes: 2 Connection Interface: Xh2.54-2p Other: Waterproof Probe Colour:black+white Material:plastic Size:42x32mm Overall Length: 83cm Package Contents: 1 X Tds Signal Adapter Board 1 X Waterproof Tds Probe 1 X Analog Sensor Line Only The Above Package Content, Other Products Are Not Included. Note: Light And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.