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Hands-free monitoring and dosing of solution ph levels. Our clever ph controller automatically monitors and fine-tunes the ph levels for you. You simply set it, and forget. The ph is taken care of. For use with reservoirs up to 200 us 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. Includes: water resistant, wall mount housing, 13 foot acid/alkali resistant dosing tube, international power supply, replaceable double junction ph probe and temperature probe (for ph atc). Use with undiluted bluelab ph up or down. 6 month guarantee for bluelab ph probe.