Liquid PH Sensor Module With Electrode Probe

This Liquid pH Sensor Kit combines a pH interface module with a BNC-type glass electrode probe, giving you everything needed to measure the acidity or alkalinity of water-based liquids across the full pH 0-14 range. The module converts the probe’s tiny signal into an analog voltage that any microcontroller with an analog input can read, including Arduino and ESP32 boards. It also works with standard pH meters and controllers.

Powered from 5V DC at just 5-10mA, the compact 42 × 32 × 20mm board suits portable and embedded builds. Response time is within 5 seconds, with readings settling in about a minute. The probe connects through a standard BNC plug, so it can be replaced when the electrode wears out.

Common uses include aquariums, hydroponic nutrient monitoring, water quality testing, fermentation, STEM experiments, and lab or field setups. Proper calibration is essential for correct readings, so use pH 4.0 and 7.0 buffer solutions (not included) and follow an Arduino calibration guide before first use. Rinse the probe with distilled water between samples and keep the electrode tip moist when stored.

Specifications :

• Detection Range : pH 0 – 14
• Output Signal : Analog voltage
• Supply Voltage : 5V DC
• Working Current : 5mA – 10mA
• Power Consumption : ≤ 0.5W
• Module Temperature Detection Range : 0°C – 80°C
• Module Response Time : ≤ 5 seconds
• Module Stability Time : ≤ 60 seconds
• Module Operating Temperature : -10°C to +50°C
• Operating Humidity : Up to 95% RH
• Module Interface : BNC socket
• Module Dimensions : 42 × 32 × 20mm
• Module Weight : ~25g
• Probe pH Range : 0 – 14 pH
• Probe Temperature Range : 0°C – 60°C
• Probe Zero Point : 7 ± 0.5 pH
• Probe Alkali Error : ≤ 0.2 pH
• Probe Slope Accuracy : ≥ 98.5% of theoretical
• Probe Internal Resistance : ≤ 250MΩ
• Probe Response Time : ≤ 1 minute
• Probe Connector : BNC plug
• Compatible Boards : Arduino, ESP32, pH meters and controllers
• Note : Calibration with buffer solution is required (not included)
• Package Includes : 1 × pH Interface Module, 1 × BNC pH Electrode Probe