Features: The TDS Meter V1.0 development board is the perfect solution for measuring total dissolved solids in your water system. Wide voltage-operation 3.3V-5.5V;0-3.3V analog- signal output compatible with- both 5V3.3V control systems- The excitation source is an AC- signal, effectively preventing probe- polarization Waterproof probe- can be immersed in water for long-term measurement Easy to connect, plug-play, no welding required Specifications: 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 ) Size: approx 42x32mm Module- interface: PH2.0-3P Electrode interface: XH2.54-2P TDS probe- Number of probes 2 Overall length: approx83cm/32.67in Connection interface: XH2.54-2P Color: Black Note: The TDS probe- cannot be used in water above 55. The TDS probe- should not be placed too close to the edge- of the container-, otherwise it will affect the value The TDS probe- head and wire are waterproof, but the connection port and signal adapter board are not waterproof Due to the different monitor- and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation- due to manual measurement. Package includes: 1PC TDS Signal Adapter Board 1PC Waterproof TDS Probe- 1PC 3Pin Analog-Sensor Cable