Monitor Oxidation-Reduction Potential (ORP) to track solution quality, disinfecting power, and sanitation throughout the growing cycle. Measuring ORP helps prevent risks such as contamination, biofouling, equipment failure, and poor crop yields while ensuring compliance with water quality certification standards.Reliable and easy to use, it’s an essential tool for maintaining optimal sanitation and water management. Backed by a 5-year warranty for added peace of mind. The Bluelab ORP Meter doubles as a pH Meter when fitted with a Bluelab pH Probe. Sold separately. 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 to keep the probe hydrated 2 metre / 6.6ft cable for measuring in hard-to-reach locations Dual compatibility allows optional use of a pH probe for comprehensive monitoring (pH probe sold separately) Auto-off function Product Contents: 1x Bluelab ORP Meter 1x Bluelab ORP Probe with storage cap 1x Bluelab KCl Storage Solution Sachet,18 ml / 0.6 fl.oz