CO2 is easy to measure with the Atlas 5. This hand held portable monitor will measure the CO2 in a room, plus the temperature and humidity. Find out quickly and accurately these important grow room measurements. Excellent for the grower who has multiple growing areas and needs to monitor these variables. The Atlas 5 will record the hi and low of these variables.Make sure your controls are working properly with the Atlas 5. Now available for rent. If you just want to check your CO2 levels or temperature or humidity, we now offer the convenience of being able to rent the Atlas 5. For only $35 you can rent it for 1 week. Pay the full price and upon return of the unit in good working condition, your purchase price will be refunded to you minus $35 and tax. Use it for 2 weeks, then the cost is $70.00 plus tax. Rental starts when the unit is shipped. Due to this offer all sales of the Atlas 5 are final, no returns accepted. Warranty is 2 years.