Specifications Platinum RTD sensors: ± 0.1% @ 32 F (0 C), Alpha: 385 per DIN 43760 Nickel RTD sensors: (#2) ± 0.5 C @ 0 C, 5,000 PPM/K T.C.R. Nickel RTD sensors: (#4) ± 0.5 F @ 70 F (21.1 C), 6,000 PPM/K T.C.R. Balco RTD sensors: ± 0.5 F @ 70 F (21.1 C), 4,300 PPM/K T.C.R Thermistor sensors: ± 0.2 C interchangeability @ 77 F (25 C) Operating Temperature: -40 F/-40 C to 210 F/100 C Flange Material: Galvanized Steel Probe Material: 304 stainless steel Bulkhead Fitting: Brass with poly compression sleeve Plastic Enclosure: Polycarbonate 30% glass filled, rated UL 94V-5-0 Steel NEMA-1/IP-30: 18 Ga. Galvanized steel Steel NEMA-4/IP-65: 18 Ga. C.R. steel, powder coated