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Atlas® 1 CO2 Monitor/Controller comes with a 25 ft remote sensor. It features adjustable set point and elevation levels, a built-in self calibration function and an integrated photocell that enables operation in daytime hours only, when the plants need CO2. Simple to use and easy to operate. 15 Amps/120 V/ 60 Hz. Replacement sensor can be purchased separately. The sensor comes factory calibrated for precise CO2 readings and utilizes low voltage technology to avoid radio frequency interference (RFI) from electronic ballasts.