Gravity: Analog Spear Tip pH Sensor / Meter Kit (for Soil and Food Applications)

The Gravity Spear Tip pH Sensor Kit is designed for measuring the pH of semi-solid materials such as wet soil, fruit, meat, and vegetables. The stainless steel spear tip protects the glass electrode and allows the probe to be pushed directly into soft materials — something standard pH probes cannot do without damage.

The kit includes a spear tip pH probe with BNC connector and a signal transmitter board with a Gravity interface, making it Arduino-compatible and easy to integrate into soil monitoring and food quality projects.

Key Features

• Spear Tip Design – Stainless steel tip for direct insertion into semi-solid materials
• pH Range – 0 to 10 pH with ±0.1 pH accuracy
• Gravity Interface – Analogue output (0–4.0V) via 3-pin PH2.0 connector
• Arduino Compatible – 5V input, plug-and-play with Gravity expansion shields
• BNC Connection – Standard BNC connector between probe and transmitter board

Specifications

• Probe Measuring Range – 0–10 pH
• Probe Accuracy – ±0.1 pH
• Transmitter Accuracy – <±0.2 pH (at 25°C)
• Operating Temperature – 5–60°C
• Response Time – ≤2 min (in standard buffer solution)
• Probe Wire Length – 850 mm (including BNC connector)
• Salt Bridge Material – PTFE
• Shell Material – POM (Polyoxymethylene)
• Transmitter Input – 5V
• Transmitter Output – 0–4.0V analogue
• Transmitter Dimensions – 43 × 32 mm

Ideal For

• Soil pH measurement for gardening and agriculture
• Food quality testing (fruit, meat, vegetables)
• Science and chemistry experiments
• Environmental monitoring projects

Package Contents

• 1× Spear tip pH probe (BNC connector)
• 1× Signal transmitter board (Gravity interface)

Resources

• Wiki documentation