DFRobot Gravity Industrial Grade Analog pH Sensor / Meter Pro Kit V2


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Approx Restocking Date: 25 to 30 Days
SKU: 1283758
  1. Supply Voltage: 3.3~5.5V
  2. Output Voltage: 0~3.0V
  3. Probe Connector: BNC
  4. Probe Type: Industrial Grade
  5. Detection Range: 0~14
  6. Temperature Range: 0~60°C
  7. Accuracy : ± 0.1pH (25 ℃)


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Brand: DF Robot
Category: Water TDS, pH, Flow, Level and Pressure Sensor

DFRobot Gravity: Analog pH Sensor pro V2 is specifically designed to measure the pH of the solution and reflect the acidity or alkalinity. It is commonly used in various applications such as aquaponics, aquaculture, and environmental water testing.

You may also check the Liquid Sensor Selection Guide to get better familiar with our liquid sensor series.

As an upgraded version of pH meter pro V1, the secondary generation pH meter pro greatly improves the precision and user experience. The onboard voltage regulator chip supports the wide voltage supply of 3.3~5.5V, which is compatible with 5V and 3.3V main control boards, such as Arduino and LattePanda. The output signal filtered by hardware has low jitter. The software library adopts the two-point calibration method, and can automatically identify two standard buffer solutions (4.0 and 7.0), so simple and convenient. It uses an industry electrode and has a built-in simple, convenient, practical connection and long life, very suitable for online monitoring.


This industry pH combination electrode is made of a sensitive glass membrane with low impedance. It can be used in a variety of PH measurements with fast response, and good thermal stability. It has good reproducibility, difficult to hydrolysis, and basically eliminates the alkali error. Between 0 to 14 pH range, the output voltage of the electrode is linear. The reference system which consists of the Ag/AgCl gel electrolyte salt bridge has a stable half-cell potential and excellent anti-pollution performance. The ring PTFE membrane is not easy to be clogged, so the electrode is suitable for long-term online detection.

With this product, the main control board (such as Arduino), and the software library, you can quickly build the pH meter, plug, and play, no welding. DFRobot provides a variety of water quality sensor products, uniform size, and interface, not only meeting the needs of various water quality testing but are also suitable for the DIY of multi-parameter water quality tester. You may also check Liquid Sensor Selection Guide to get better familiar with our liquid sensor series.

The pH is a value that measures the acidity or alkalinity of the solution. It is also called the hydrogen ion concentration index. The pH is a scale of hydrogen ion activity in the solution. The pH has a wide range of uses in medicine, chemistry, and agriculture. Usually, the pH is a number between 0 to 14. Under the thermodynamic standard conditions, pH=7, which means the solution is neutral; pH<7, which means the solution is acidic; pH>7, which means the solution is alkaline.

Arduino Connection Diagram

Useful Link:



  1. 3.3~5.5V wide voltage input
  2. Hardware filtered output signal, low jitter
  3. Gravity connector and BNC connector, plug-and-play, no soldering required
  4. Software library supports two-point calibration and automatically identifies standard buffer solution
  5. Uniform size and connector, convenient for the design of mechanical structures
  6. Industrial Probe – Support 7*24 Measurement
  7. Upgraded Transmitter – More Accurate and Stable

Signal Conversion Board (Transmitter) V2

  1. Signal Connector: PH2.0-3P
  2. Measurement Accuracy: ±0.1@25℃
  3. Dimension: 42mm*32mm/1.66*1.26in

pH Probe

  1. Response Time: <1min
  2. Probe Life: 7*24hours >0.5 years (depending on the water quality)
  3. Cable Length: 500cm

Useful Links:

Getting Statred

Package Includes:

1 x pH Probe (Industrial Grade)

1 x pH Signal Conversion Board V2

1 x Gravity Analog Sensor Cable

2 x Waterproof Gasket

1 x Screw Cap for BNC Connector

4 x M3 * 10 nylon pillar

8 x M3 * 5 screws

Power Supply Voltage (V)


Output Voltage (V):





Industrial Grade

Operating Temperature (°C)



± 0.1pH (25 ℃)

Shipping Weight 0.35 kg
Shipping Dimensions 22 × 8 × 6 cm
6 Months Warranty

This item is covered with a supplier warranty of 6 months from the time of delivery against manufacturing defects only. This is a quality product from the original manufacturer. Only manufacturing defects are covered under this warranty. Reimbursement or replacement will be done against manufacturing defects.

What voids the warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

Questions and answers of the customers

    Can it be used immersed for long time say in terms... Read more
  1. 0 votes
    Q Can it be used immersed for long time say in terms of months ? answer now
    Asked by mavenenggsol on October 2, 2023 6:13 am

    Yes you can use it immersed for a long time (mo... Read more

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Country Of Origin: China

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