... 4 (AUX)Part 1 stands for Model seriesAI-216P, standard artificial intelligence temperature controller 0.3%FS±1°Caccuracy. 1°C ... Technical SpecificationInput type :Thermocouple: K(0-1300C), S(0-1700C), R(0-1600C), E(0-1000C),J(0-1200), N(0-1300C),PT100(-200~+800C)Measurement ... consumption: ≤3W.Ambient temperature: -10~+60°C, Humidity: 0~90RH%same function model YUDIAN AI-216P,AI-516P,AI-526P,AI-518P