Milwaukee Instruments pH Monitor w/Hi-Low Alarm LED & User Set Point microbial fertilizer The SG ballast offers a

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Milwaukee Instruments pH Monitor w/Hi-Low Alarm LED & User Set Point microbial fertilizer The SG ballast offers aProfessional pH monitor especially designed for use with aquariums The Milwaukee MC120 pH Monitor is designed to continuously monitor pH, EC or TDS values directly in your reservoir. Features a user selectable set point. An LED visual alarm is activated and flashes when the pH, EC or TDS levels rise either above or Below (user selected) that set point. Runs on a 12V adapter, so there's no need to worry about failed batteries, and each unit comes with