The 67 controller is way better then the controller that comes with the “t” series fans.
The controller is Bluetooth and the app is really nice, having the ability to monitor all your grows from your easy chair. The app allows complete control of the programming of the controllers.
It also displays and exports graphs of temp and humidity changes over time.
But even nicer then all that is the programming changes. You start out by setting an on speed and an off speed. The on speed is the maximum speed the fan will reach when triggered, and the off speed is the lowest speed the fan will run, even if it is not activated by humidity or temperature triggers.
The on setting is the maximum that the fan will reach, you get to set up ramp up speeds. If the temperature (or humidity) trigger is reached the fans speed will only increase by 1 or 2 (your choice) unless it can’t keep up, then it continues to ramp up fan speed until it reverses the trigger, or it reaches the maximum “on” speed.
Buy the controller 67, it’s worth it.