PH Sensor Kit for Arduino, 0-14 Detection Range with BNC Electrode Probe and Module, Liquid Water Quality Tester for Lab(pH probe)

This pH sensor kit delivers reliable 0-14 range detection suitable for Arduino water quality projects. The BNC electrode probe connects cleanly to the signal conditioning module, which outputs 0-5V analog readings compatible with standard ADC inputs. Calibration requires two-point procedure using buffer solutions, taking roughly 10 minutes once you understand the process.

The probe construction feels reasonably robust, though the glass electrode demands careful handling—I'd recommend adding protective caps for storage. Signal stability improves after 30 seconds of immersion. The included module lacks on-board amplification, so noise filtering in firmware is essential for clean readings in real-world conditions.

Accuracy sits around ±0.2 pH units across the range, acceptable for hobbyist water monitoring but marginal for precise lab work. Response time spans 30-60 seconds depending on solution temperature, limiting rapid sequential measurements. Build quality is respectable for the price point, though electrode replacement costs can accumulate.