The Ageon A104 is a digital temperature controller from the Black Line designed for refrigeration systems without defrost, widely used in milk cooling tanks. It provides two relay outputs (compressor and stirrer) and an integrated voltage monitor with adjustable thresholds and delays. The unit reads an NTC temperature probe in a stainless‑steel sheath and covers a −50 to +100 °C range with 0.1 °C resolution. The front panel is IP65 and the sensor is IP68. Electrical supply is 220 Vac (±10%). A timer function supports cyclic agitator operation. For supervision, it is compatible with Ageon’s WebFi/ArcSys remote monitoring. Relay ratings are 10 A at 250 Vac each, with an 18 A combined limit. Panel cutout is 70 × 29 mm.