Water Quality Analog TDS Sensor (DFRobot Gravity)

Out Of Stock



The Gravity: Analog TDS Sensor/Meter for Arduino is a versatile kit designed to measure total dissolved solids (TDS) in water using an Arduino board. TDS indicates the concentration of dissolved minerals, salts, and substances, reflecting water cleanliness and quality. Ideal for various applications such as domestic water testing and hydroponics, this sensor kit offers compatibility with Arduino boards, ensuring seamless integration into diverse projects. With a wide voltage input range of 3.3V to 5.5V, it suits both 5V and 3.3V control systems. Its analog voltage output range of 0V to 2.3V facilitates easy project integration. Notably, it employs an AC signal as the excitation source to prevent probe polarization, enhancing lifespan and signal stability. Additionally, the waterproof probe allows prolonged immersion for accurate measurements.



  • Wide Voltage Input: Supports 3.3V to 5.5V, compatible with various control systems.
  • Good Compatibility Output: Provides a 0V to 2.3V analog signal output, suitable for both 5V and 3.3V controllers.
  • AC Excitation Source: Prevents probe polarization, improving lifespan and signal stability.
  • Waterproof Probe: Allows extended immersion in water for accurate measurements.
  • Easy to Use: Arduino compatible, plug-and-play design for effortless integration without soldering.



Signal Transmitter Board:

  • Input Voltage: 3.3V to 5.5V
  • Output Voltage: 0V to 2.3V
  • Working Current: 3mA to 6mA
  • TDS Measurement Range: 0ppm to 1000ppm
  • TDS Measurement Accuracy: ±10% F.S. (25°C)
  • Module Size: 42mm x 32mm
  • Module Interface: PH2.0-3P
  • Electrode Interface: XH2.54-2P

TDS Probe:

  • Number of Needles: 2
  • Total Length: 83cm
  • Connection Interface: XH2.54-2P
  • Color: Black
  • Other: Waterproof Probe
Num Label Description
1 - Power GND(0V)
2 + Power VCC(3.3 ~ 5.5V)
3 A Analog Signal Output(0 ~ 2.3V)
4 TDS TDS Probe Connector
5 LED Power Indicator
Package Includes:
  • Analog TDS Meter for Arduino x1
  • Waterproof TDS Probe x1
  • 3Pin Analog Sensor Cable x1