The Gravity: Lab Grade Analog pH Sensor Kit (SEN0161-V2) is a high-precision sensor designed for measuring the pH level of liquids, reflecting their acidity or alkalinity. It is widely used in aquaponics, aquaculture, environmental monitoring, and water quality analysis.
This upgraded version features improved accuracy and a better user experience compared to V1. The onboard voltage regulator supports a wide input range of 3.3V to 5.5V, making it compatible with both 3.3V and 5V microcontrollers like Arduino. The output signal is hardware-filtered, reducing noise and ensuring low jitter. The included Arduino library supports two-point calibration and can automatically identify standard buffer solutions (pH 4.0 and pH 7.0), making the setup simple and reliable.
Projects
Project 1. Calibrating an Analog pH Sensor (with Linear Algebra)
Introduction: This video is an overview and tutorial for an analog pH sensor that's compatible with both Arduino and Raspberry Pi. It will also give a general overview of linear functions and interpolation. Plus it will show you how to write a custom code to use this sensor on an unsupported platform (Espruino).
Project 2. How to use DFRobot pH Meter module with an ESP32
Project 3. How to measure and indicate the pH of liquids with Arduino and LCD
Introduction: This video will show how to measure the pH of common liquids in our home in an easy and comfortable way perfect for monitoring the pH of fish, chemicals, etc.
Project 4. pH Sensor: Assembling, Coding, & Calibrating with Arduino | Smart Gardening
Introduction: This video talks about what pH sensors are, why use them for aquaponics system, and how to assemble, code, and calibrate the Gravity: Analog pH Sensor (Version 2).
Project 5. How to use pH meter V2 in ESP32 with new calibration
Introduction: This tutorial will teach you how to program with esp32 and how to do calibration with arduino IDE, how to use ph meter v2 in esp32 with new calibration.
Key Features
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Wide voltage input (3.3~5.5V), compatible with both 3.3V and 5V boards
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Low-jitter output signal thanks to hardware filtering
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Gravity interface and BNC connector for easy, plug-and-play setup
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Two-point calibration via software library with auto buffer recognition
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Uniform sensor size and connector for easier system integration
Applications
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Aquaponics and hydroponics systems
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Aquaculture water quality monitoring
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Laboratory chemical testing
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Environmental water sampling
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DIY multi-parameter water testing kits
Technical Specifications
Signal Conversion Board (Transmitter V2)
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Supply Voltage: 3.3~5.5V
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Output Voltage: 0~3.0V
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Probe Connector: BNC
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Signal Connector: PH2.0-3P
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Measurement Accuracy: ±0.1 @ 25℃
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Board Dimensions: 42mm × 32mm (1.66 × 1.26 in)
pH Probe (Lab Grade)
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Detection Range: 0 ~ 14 pH
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Zero Point: 7 ± 0.5
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Temperature Range: 5 ~ 60°C
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Response Time: < 2 minutes
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Internal Resistance: < 250MΩ
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Probe Life: > 0.5 years (depends on usage)
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Cable Length: 100cm
Package Contents
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1x Lab Grade pH Probe
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1x pH Signal Conversion Board (Transmitter V2)
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1x Gravity Analog Sensor Cable
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2x pH Standard Buffer Solution 4.0
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2x pH Standard Buffer Solution 7.0
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2x Waterproof Gasket
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1x Screw Cap for BNC Connector
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4x M3 × 10 Nylon Pillar
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8x M3 × 5 Screws
Important Notes
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Keep the BNC connector and signal board dry and clean to avoid measurement errors.
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Avoid placing the board on wet surfaces; use nylon pillars for mounting.
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The glass bulb at the probe tip is delicate — handle with care to prevent damage.
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Do not leave the probe connected to the board without power for long periods.
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Crystals forming around the protective cap are normal and do not affect accuracy. Return them to the cap if possible.