Wide Voltage Input: 3.3~5.5V Good Compatibility Output: 0~2.3V analog signal output, compatible with 5V or 3.3V controller AC Excitation Source: effectively prevent probe from polarization Waterproof Probe Easy to Use: for Arduino compatible, simple connection, plug and play without soldering Signal Transmitter Board: Input Voltage: 3.3 ~ 5.5V Output Voltage: 0 ~ 2.3V Working Current: 3 ~ 6mA TDS Measurement Range: 0 ~ 1000ppm TDS Measurement Accuracy: ± 10% F.S. (25 ℃) Module Size: 42 x 32mm Module Interface: PH2.0-3P Electrode Interface: XH2.54-2P TDS probe: Number of Needle: 2 Total Length: 83cm Connection Interface: XH2.54-2P Other: Waterproof Probe Output Voltage: 0~2.3V analog signal output, compatible with 5V or 3.3V controllers Signal Transmitter Board: AC Excitation Source to prevent probe polarization and prolong life TDS probe: Waterproof with 2 needles and 83cm total length Other: Gravity-based design for easy installation Attention: 1. The probe can not be used in water above 55 degrees centigrade. 2. The probe can not be left too close to the edge of the container, otherwise it will affect the reading. 3. The head and the cable of the probe are waterproof, but the connector and the signal transmitter board are not waterproof. Please be careful. Color: As Shown Material: PCB Package Contents: 1set * TDS Meter V1.0 development board