Our standard RTD probe uses a 100 ohm platinum element with alpha = 0.00385. Sheath material is SS 304 and be either 3/16" or 1/4" diameter with a length of five inches. Units are available with either a standard size plug or teflon insulated lead wire. When ordered with a plug; the plug typically has three prongs. Units with lead wire can be either two or three conductor. Available with stainless steel overbraid for added durability.