CO2 Controller with High-Temp ShutoffSimple CO2 controller with display and day night detection. Very easy to install and set up. The PNG 060 comes with a high temperature shutoff to protect your plants from overheating: CO2 enrichment is stopped when the temperature set point is reached. Displays ambient CO2 level Day and night detection Adjustable CO2 setpoint from 400 ppm to 2100 ppm High temperature shutoff feature from 50F to 130F Adjustable differential Easy one button calibration