Gravity: Analog pH Sensor/Meter Kit V2

The Gravity Analog pH Sensor/Meter Kit V2 is designed to measure the pH of liquids, indicating acidity or alkalinity on a scale of 0–14. It's commonly used in aquaponics, aquaculture, hydroponics, and environmental water testing. The kit includes a laboratory-grade pH probe, a signal conversion board, calibration buffer solutions, and a Gravity analogue sensor cable — ready to use with Arduino and other microcontrollers.

This V2 version features a wide-voltage onboard regulator (3.3–5.5 V), hardware-filtered output for low signal jitter, and a software library with two-point calibration that automatically identifies pH 4.0 and pH 7.0 standard buffer solutions.

Key Features

• 3.3–5.5 V Wide Voltage Input – Compatible with both 3.3 V and 5 V controllers
• Hardware-Filtered Output – Low jitter for stable readings
• Two-Point Auto-Calibration – Software library identifies pH 4.0 and 7.0 buffers automatically
• Plug-and-Play – Gravity connector and BNC probe connector, no soldering required
• Measurement Accuracy – ±0.1 pH @ 25 °C

Specifications

Signal Conversion Board (V2)

• Supply Voltage – 3.3–5.5 V
• Output Voltage – 0–3.0 V
• Probe Connector – BNC
• Signal Connector – PH2.0-3P (Gravity)
• Accuracy – ±0.1 @ 25 °C
• Dimensions – 42 × 32 mm

pH Probe

• Type – Laboratory grade
• Detection Range – pH 0–14
• Temperature Range – 5–60 °C
• Zero Point – pH 7 ±0.5
• Response Time – <2 min
• Internal Resistance – <250 MΩ
• Probe Life – >6 months (depending on usage frequency)
• Cable Length – 1 m

Ideal For

• Aquaponics and hydroponics monitoring
• Aquaculture water quality testing
• Environmental and water treatment analysis
• DIY multi-parameter water quality meters

Resources

• Product Wiki

Package Contents

• 1× pH Probe (laboratory grade)
• 1× pH Signal Conversion Board (V2)
• 1× Gravity Analogue Sensor Cable
• 2× pH 4.0 Standard Buffer Solution sachets
• 2× pH 7.0 Standard Buffer Solution sachets
• 2× Waterproof gaskets
• 1× BNC connector screw cap
• 4× M3 × 10 mm nylon standoffs
• 8× M3 × 5 mm screws