The Bluelab pH Controller Connect constantly monitors and fine-tunes the pH levels for you. But more than that, it wirelessly data logs to your computer too, putting continuous information at your fingertips. Use the data to make system changes faster for the ultimate crop. You can also change the settings from your PC. The Bluelab Connect Stick is required, sold separately. Local and cloud data logging capability (download free Bluelab Connect Software). Option to view data and current status remotely via Google Docs. For use with reservoirs up to 200 gal/760 L. Plant-safe green back lit LCD with adjustable brightness and large, easy to read display. Easy to navigate menu to program, adjust settings and calibration by a simple push of a button. Flashing high/low alarm with control lockouts to protect from over-dosing. Auto resume dosing on restart after power loss. Use with undiluted Bluelab pH Up or Down. Compatible with Bluelab Connect Stick and Connect Range Extender. 6 month guarantee for Bluelab pH Probe.