4-Wire Platinum RTD Probe with Amphenol Connector. PVC jacked cable (1/4" O.D.) with armor shield to prevent damage from pinching or being ran over in the field. Probe itself is 12" in length and 0.25" in diameter. The RTD Comes standard with Stainless Steel compression fitting and nylon ferrule. Please use thermowells to install RTD probes inside a pipe with live pressure to ensure safety. Stainless steel ferrules are available upon request. Please read the user manual before using all products. Every RTD is tested and reported on the product NIST Cert with Data that is traceable back to a primary temperature standard.