DFRobot Gravity - pH analog sensor/meter

Index: DFR-05874 EAN: 6959420908356

Analog pH meter with an analgue output. Allows to measure water quality. It has an accuracy of +/- 0.1 pH, which is sufficient for most applications. Equipped with LED, BNC connector and PH2.0 interface.

DFRobot Gravity - pH analog sensor/meter
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Manufacturer: DFRobot
Compatibility: Arduino

Product description: DFRobot Gravity - analog pH sensor / meter

Analog pH meter compatible with Arduino. Allows you to measure the quality of water. Has an accuracy of +/- 0.1 pH, which is sufficient for most applications. Equipped with LED, BNC connector and PH2.0 interface. Comes with a cable suitable for DFRobot IO Expansion Shield.

Product compatible with Arduino

Sample code and detailed information can be found in the user guide.

The sensor works with any microcontroller equipped with analog inputs, including Arduino. To read the data, simply connect the power supply and output pin to any analog input of the microcontroller and read the measurement result.

Example of sensor connection.


  • Supply voltage: 5 V
  • Measuring range: from 0 pH to 14 pH
  • Operating temperature: from 0 °C to 60 °C
  • Accuracy: +/- 0.1 pH (25 °C)
  • Response time: up to 1 min
  • pH sensor with BNC connector
  • PH2.0 interface
  • Gain adjustment by potentiometer
  • Cable for connection to DFRobot IO Expansion Shield
  • Board dimensions: 43 x 32 mm

DFRobot Gravity analogue pH sensor / meter

This is the second version of the Gravity series pH sensor from DFRobot. Compared to the first version, the accuracy of the sensor has been improved. Analog pH meter can be used in the construction of measuring systems to test the quality parameters of environmental conditions as a pH meter of water, as well as in laboratory equipment to test the reaction of chemical substances. The built-in integrated voltage regulator allows the module to be powered from sources ranging from 3.3 V to 5.5 V, typical of most prototype boards such as Raspberry Pi and Arduino.

DFRobot Gravity analog pH sensor - principle of operation and application examples

The Gravity series pH indicator can work with Arduino boards, among others. Thanks to this, you can easily connect the sensor to the control system without any soldering and upload ready-made library to the memory of microcontroller communicating with the sensor. By measuring the pH of the substance of interest, we can find out if the substance is acidic (0

DFRobot Gravity - analog pH sensor / meter

The DFRobot Gravity - Analog Water pH Meter is a fully instrumented sensor that, when connected to a suitable device, will return a measurement result. The product is not only the sensor itself, but also the container in which the liquid to be tested is to be placed, as well as all necessary wires, PH2.0 interface, electronic circuit with LED, necessary outputs and potentiometer.

The sensor just needs to be connected to any development board with inputs for analog signals (for example, to Arduino). The device will quickly return a ready result.

Water PH meter

The device is able to measure the PH of water with an accuracy of tenths of a part. With it, you can easily build a drinking water fitness station.

A very big advantage of the product is that you do not need to do any soldering work before use. To get started, just connect the sensor to, for example, Arduino and use the ready-made library (for reading values from this sensor) and then display them on the screen.

Package width 22 cm
Package height 9 cm
Package depth 4 cm
Package weight 0.099 kg



Question: Hi. I need to build a pH measurement system in the aquarium based on this electrode, and here comes my question. Can the electrode be in the water for a long time? How to clean it from algae and tarnish? Greetings Gregory
Answer: Unfortunately, we did not test the meter in such a way, but looking at the specifications, the Pro version will definitely be a better choice - https://botland.com.pl/gravity-czujniki-pogodowe/6112-dfrobot-gravity-czujnik-miernik-ph-pro-analogowy-5903351243292.html


Question: Good day. I am trying to purchase a pH sensor. I am wondering how the V1 model differs from the V2. It is known that in V2 there are calibration fluids but has anything else been improved? Which one will work better with esp32? With best regards Grzegorz Labudda
Answer: Among the differences are the contents of the kit - the kit in the V2 version also has 4 pH buffer solutions. However, the module has a longer response time - up to 2 min. It has higher measurement precision than the V1 version, and the supply voltage range has also been increased (from 3.3 V to 5.5 V).

Product reviews

DFRobot Gravity - pH analog sensor/meter


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Sławomir 14.10.2022 Confirmed purchase Translated review
ok everything as described
Piotr P. 01.10.2021 Confirmed purchase Translated review
It is a very good pH-metric probe, sufficient for basic pH measurements.
Marcin G. 29.03.2021 Confirmed purchase Translated review
Great device!
Pavel 19.05.2023 Confirmed purchase
Jiří 20.12.2022 Confirmed purchase

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