The DEC-HH-1 is a device that can be used with the DEC family (UC & VAV) of controllers to adjust and configure certain parameters within the controller that it is attached to. The primary use is to configure network parameters such as Node ID, baud rate, date/time etc. When attached to DEC-VAV controllers, the DEC-HH-1 becomes a VAV box balancing tool. The air balancer can easily adjust parameters of the DEC-VAV controller to properly commission and balance the VAV box. The tool also has the ability to manually "force" inputs and outputs to any desired value so that diagnosis and system commissioning can be done easily.