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Orion silver/silver chloride, Ag/AgCl, references are widely used because of their accuracy and broad temperature range. Teamed with the introduction of the Orion Star Series, Thermo Scientific has also introduced the new WP- waterproof and secure electrode connectors, a revolutionary feature of the new Orion Star Series Meters. The BNWP connector provides a waterproof and secure connection when used with the new Orion Star Series meters. The BNWP connector is compatible with any standard BNC connector both on Orion meters and competitive meter models. Glass body "hard nose" bulb pH Electrode. Recommended Use: For rugged, durable lab use. Cap diameter is 16 mm.