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- $699.95Sentinel CPPM-4i CO2 Controller - fuzzy logic photocell ppm CPPM-4
At first look, the CPPM-4i is similar to the CPPM-1 – Identical button controls, layout and color coding make it easy to transition to the new product. However, the similarities end there. The following is a list of improvements and design modifications which are incorporated in the CPPM-4i:Learn More