Seeed Studio Industrial pH Meter / Sensor is designed to monitor pH levels in soil and water applications. This pH meter/sensor measures the hydrogen-ion activity in water-based solutions, indicating its acidity or basicity expressed as pH. The pH meter/sensor (S-pH-01B) is designed with industry standards and equipped with a waterproof aviation connector. This meter / sensor adopts international advanced solid dielectric and large-area polytetrafluoroethylene liquid junction. The pH meter / sensor is designed with Automatic Temperature Compensation (ATC) that makes sure the data is accurate regardless of the temperature changes. This pH meter / sensor is IP65 rated waterproof in a tight seal making it capable of withstanding long-term constant use in professional application scenarios. Applications include agriculture, animal husbandry, forestry and horticulture, sewage treatment, swimming pools and spas, scientific experiments, and educational projects.