Compact and easy-to-use, the Atlas? 9 is a grower's dream. The 15 ft remote sensor allows you to measure the CO2 levels of your garden exactly where you need to measure them. Fuzzy logic capabilities allow you to accuratly dose CO2 when using a CO2 regulator. The knob that doubles as a button when pushed lets you easily program this product. Enclosure resists dust, rust and moisture. 10 Amps maximum/120 V/ 60 Hz.