Oakton combination electrodes are available in a variety of styles to meet the needs of your application. Epoxy electrodes are impact resistant and provide excellent durability for field applications. Glass electrodes withstand aggressive chemicals. Choose junction and tip style based on the needs of your application. All electrodes feature Ag/AgCl reference cells. What's included: direct-connect models include a BNC connector. Other models add a 3.3-D (1-m) cable. Outstanding value at an economical cost! compatible with all Oakton brand pH meters