Orion Epoxy Body Triode 3-in-1 pH/Automatic Temperature Compensation Probe, EDIN Waterproof Connector with Banana Plug, 0 to 14 pH Triode, gel-filled combination electrode with epoxy body for durability Measures pH and temperature with built-in ATC Waterproof E DIN connection with a 6 m cable and banana plug connectors Ag/AgCl (silver/silver chloride) electrolyte for less noise (unwanted voltages) than gold or silver electrodes pH range of 0 to 14