Specifications Platinum RTD Sensors: ± 0.1% @ 32°F (0°C), Alpha: 385 per DIN 43760 Nickel RTD Sensors: ± 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 Steel NEMA-1/IP-30: 18 Ga. Galvanized steel Steel NEMA-4/IP-65: 18 Ga. C.R. steel, powder coated Probe Material: 3/8-inch aluminum coil