Information at the NortekUSA website can be found in several different places:
The Product section contains the basic information about each product application and specifications.
The Knowledge Center contains articles and tutorials that can give you a better understanding of the measurement principles, performance, and applications.
The Support section contains (free) software and firmware upgrades, manuals, and other types technical support tools
The Nortek Forum is an excellent resource allowing you to post new questions or to search for answers to previously posted questions. The Nortek Forum is located on the Nortek AS website and clicking on the link here will take you away from the NortekUSA website.