This pH sensor kit includes a liquid pH interface module and a BNC-type pH electrode probe. It provides analog voltage output corresponding to pH levels and is suitable for integration with microcontrollers and pH meters. Ideal for water quality monitoring, hydroponics, and STEM experiments.

Specifications – Sensor Module

• Heating Voltage: 5 V DC
• Working Current: 5 mA – 10 mA
• Detection Range: 0 – 14 pH
• Temperature Detection Range: 0 °C – 80 °C
• Response Time: ≤ 5 s
• Stability Time: ≤ 60 s
• Power Consumption: ≤ 0.5 W
• Operating Temperature: –10 °C to 50 °C (nominal 20 °C)
• Operating Humidity: up to 95% RH (nominal 65% RH)
• Service Life: ~3 years
• Output Signal: analog voltage
• Dimensions: 42 mm × 32 mm × 20 mm
• Weight: ~25 g
• Interface: BNC socket for probe

Specifications – BNC Electrode Probe

• pH Range: 0 – 14 pH
• Temperature Range: 0 °C – 60 °C
• Zero Point: 7 ± 0.5 pH
• Alkali Error: ≤ 0.2 pH
• Slope Accuracy: ≥ 98.5% theoretical
• Internal Resistance: ≤ 250 MΩ
• Response Time: ≤ 1 min
• Connector: BNC plug
• Compatibility: standard pH meters and controllers

Features

• BNC probe with fast response and stable readings
• Analog output for microcontroller interfacing
• Suitable for aquariums, hydroponics, and lab experiments
• Compatible with Arduino, ESP32, and pH monitoring systems
• Common use cases:
  - Water quality monitoring
  - Nutrient solution control in hydroponics
  - pH measurement in STEM kits
  - Laboratory and field testing setups

NOTE: You will also need pH Probe Tester Buffer Powder for calibration.

Good tutorial for calibrating the module and reading data: Electroniclinic

Good video tutorial: YouTube

Without proper calibration (as described in the above tutorial in section "pH Sensor Calibration"), it won't produce correct results.