Series 3R probes are metallic rods with threaded end
For general purpose use
316 stainless steel for different applications
For use with Series 3E, 3F, 3G, 3B fittings
1/4" (0.64 cm) threaded rod
Gems probes are metallic rods with threaded ends that screw into a fitting that extends vertically down into the liquid. Series 3R: 1/4" (0.64 cm) threaded rod. 3' probe length. 1/4" NPT male.