Dependable double-junction pH probe technology that's built to last *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