Atlas® 1 CO2 Monitor/Controller comes with a 25 foot 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 Volt/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. Digital control board delivers precision CO2 control Maximize your garden's CO2 level while minimizing CO2 tank or LP consumption Adjust CO2 set point, modify elevation or calibrate with just two buttons Can control both bottled CO2 tanks or CO2 generators! Controls any CO2 equipment that is operated by 120 volt power Durable powder coated, steel enclosure will stand up to the toughest conditions Adds CO2 only during daylight period by using the controllers integrated photocell 50 parts per million (ppm) deadband/hysteresis built into set point Memory retains controllers settings even when the power is off ETL listed for use in commercial applications 15 amps/120 Volt/60 Hz 3 year warranty If you're confused or have questions about CO2, check out our CO2 buyers guide. Want to know know long your tank will last in your growing space? Using a co2 calculator will help you use your CO2 efficiently. Easy Guide Instructions Titan Controls Product Selector Controller Specifications: Sampling Method = Infrared Diffusion Measurement Range = 300 PPM to 5100 PPM Control Range = 0 PPM to 2050 PPM Accuracy: +/- 5% (total reading) Response Time: Approximately 45 seconds Fixed Hysteresis/Deadband = 50 PPM (centered) Signal Update: Displayed CO2 PPM reading updates once every 3 seconds Warm-up Time: Approximately 30 minutes Recommended Calibration Interval = Every 3 years Stability: Typical Deviation ±75 PPM a year Operating Temperature =