I purchased some of both the Rightsign ($49 for 5 and $19.95 for 2) and the Hough ($65 for 5 tests) kits before Christmas
Just opened the Hough kit, wow is it complicated compared with the other, you have to pour liquid into the tube (other brands the tubes come pre-filled, so you don't have to worry about spillage) plus there is the whole UV light extra step. I think that is where they are jacking up the price because they have to supply the light and the battery.
Also because you have to shine the light to see the result, you cant easily photograph your result, as I need to do today to send so I can attend a job tomorrow.
I will not buy the Hough Brand again.