I wouldn't go with powdered urine that your looking at. Most of us on this site prefer and swear by Quick Fix. This product is manufactured by spectrum labs and is the best out there. There have been alot of posts lately on QF success storys, so read up. It comes with a heating pad and temperature gage to insure proper temp at test time. Read the substitution sticky it the top of the forum and it will tell you everything you need to know.:thumbsup: