The Allergenco adapater is for those who have already made the decision to invest in the best indoor air quality testing equipment by purchasing the ET or ET Lite, but are still not willing to use the best testing media. This adapter fits on top of the ET just like a cassette would, just with a slightly larger intake on top.
This adapter does not change the functionality of the device. The allergenco adapter is free upon request with purchase of an ET or ET Lite, but will be $10 if purchased a month or more after purchase.