Specifications Platinum RTD Sensors: +/- 0.1% @ 0 C, Alpha : 385 per DIN 43760 Nickel RTD Sensors: (#2) +/- 0.5 C @ 0 C, 5000 PPM/K T.C.R. Nickel RTD Sensors: (#4) +/- 0.5 F @ 70 F / 21.1 C, 6000 PPM/K T.C.R. Balco RTD Sensors: +/- 0.5 F @ 70 F / 21.1 C, 4300 PPM/K T.C.R. Operating Temp: -40 F - 200 F (-40 C - 93 C) Thermistor Sensors: +/- 0.2 C interchangeability @ 77 F / 25 C 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. Cold Rolled Steel, Baked on Enamel Warranty: Five Years (Lifetime on Moisture Migration) EMC Conformance: EN 55022, 55024, 61000-3-3, 61000-4-2, 3, 4, 5, 6 & 11 RoHS Compliant U.S. PATENT NO. 6592254, 7465087