Bluelab pH Probe - Dependable double-junction pH probe technology that's built to last The durable Bluelab pH Probe has been designed with longevity in mind, with a double-junction probe, polycarbonate housing and high-quality electrical components. Created with advanced and affordable technology, you can rely on Bluelab’s pH Probe to give you accurate and fast measurements every single time. Product Features: Double-junction probe reduces reference contamination, extending longevity Fully waterproof - not just water resistant BNC connector allows use with all other compatible Bluelab and Autogrow products 2-metre cable for measuring in hard-to-reach locations Use the included storage cap with KCl to lengthen probe’s lifespan Fast sensor response ensures quick and accurate measurements Polycarbonate housing for long-lasting strength Effective in solutions of 0.2 EC and above