The DOL 104 Humidity Sensor (Manufacturer No. 140275) is a high-precision relative humidity sensor engineered for continuous operation in high-moisture industrial and agricultural environments. It provides an analog output signal of 0–3 V with very low output resistance and full protection against short circuits and cable faults. Operating within a measurement range of 0–100% RH, the sensor delivers an accuracy of ±3% RH (40–85%) and ±4% RH (10–95%) at 0–40 °C. The DOL 104 features a specialized sensing element with an integrated filter, ensuring long-term stability even in livestock facilities where humidity levels remain elevated. Controlled by a microprocessor, it includes a dual-color LED indicator for operational and fault diagnostics, and an optional protective cap enables cleaning without sensor removal. With a supply voltage range of 11–30 V DC and a typical current consumption of 12 mA (35 mA max), it offers robust performance and a fast response time of 20 s (T63 at 0.5 m/s). Rated IP67, the DOL 104 ensures full dust and water protection. The DOL 104 may be utilized in North America, Europe, Asia, and worldwide installations requiring accurate, durable, and maintenance-friendly humidity sensing for livestock management or industrial environmental monitoring systems.