Bluelab ORP Meter — Monitor ORP for Solution Quality & Sanitation Stay on top of water and nutrient solution hygiene with the Bluelab ORP Meter, a handheld tool that measures Oxidation-Reduction Potential (ORP). ORP helps you track overall solution quality, disinfecting power, and sanitation performance throughout the growing cycle—especially useful when you want confidence that your sanitation program is working consistently. Built for daily use, this meter combines a bright backlit display with a durable, replaceable probe system and long cable reach for reservoirs and hard-to-access tanks. There’s no ORP probe calibration required, making ORP checks fast and straightforward. Key Benefits Monitors ORP (oxidation-reduction potential) to assess sanitation and disinfecting strength Helps track solution quality throughout the grow cycle No ORP calibration required for simpler routine checks Replaceable probe design for long-term value Features Compact handheld design for convenient use Bright, easy-to-read backlit display Replaceable Bluelab ORP Probe with BNC connection No ORP probe calibration required KCl-filled probe cap keeps the probe hydrated between uses 2 m / 6.6 ft cable for measuring in hard-to-reach locations Dual compatibility: optionally use a Bluelab pH probe for broader monitoring (pH probe sold separately) Auto-off function to save battery Tip: Keep the probe tip stored in KCl solution when not in use to maintain response speed and extend probe life.