The Omega manufactured PRS-3 Series sanitary RTD sensors feature two types of probes: Heavy-duty probe stem has a stepped design for additional strength and standard duty is ¼" (0.250") diameter probe. Both are a great deal and both feature standard probe lengths of 3", 4", 5", and 6" with other probe lengths available. Both heavy duty and standard duty feature wetted surfaces are 316L stainless steel, surface finish equals 32 Microinch or better. Both are said to be ideal for CIP and sanitary process.Price starts at $120.