Specifications Platinum RTD sensors: ± 0.1% @ 32°F (0°C), Alpha: 385 per DIN 43760 Nickel RTD sensors (#2): ± 0.5°F @ 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: -40F/-40C to 210F/100C Flange Material: Galvanized 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 Probe Material: 304 Stainless Steel