The RF style RTD combine all of the positive attributes of the RL style with the added protection of flexible stainless steel armor covered lead wires.  The probes are designed for rugged applications featuring a ¼” stainless steel flexible armored hose to protect lead wires from damage.  Probes are 316 stainless steel and available in .188” or 250” diameters.   Provides accurate and repeatable results in low temperature applications -58 to 204°C continuous or -58 to 500°F (-50 to 260°C) single use or Fiberglass wire up to 900°F (480°C).