Standard Model. Flat CPT Porous Plug, for general use in soil and (with Submersible Adapter) for use in water.
Approximate overall Size: 1 3/8" dia. x 6" long. Dry weight: 4 oz.
The portable copper/copper sulphate reference electrode is a Lexan Tube, a CPT ceramic plug, and a strong top cap with a 1/4" high-purity copper rod with 1/4 x 20 external thread and brass knurled nut.
Model RE-5 Electrode