Doesn't seem to be any QF 4.2 just the same 4.0
urineluck. com /ProductDetails.asp?ProductCode=QFIX

If you've been clean for months you're probably fine to use your own urine. A faint thc line is normal.
Bottles work the best. I don't like the squirt tip. Sometimes it makes noise.
I use a digital thermometer because sometimes the temp can be a little high or low and you can't tell which by feel. So the thermometer is good for double checking.
killerweed420 Reviewed by killerweed420 on . First time ever testing and subbing Hi everyone, HAPPY 4TH OF JULY! I am new to this site (bummed I did not discover it long ago) and have been amazed with all the stuff I have been reading on this forum about drug testing. Basically, I have been a smoker pretty much everyday for the last 8 years...I stopped months ago but am still getting faint lines onhome tests and that makes me verrrrrry uncomfortable. I am getting a job at a hospital and Knew ahead of time that they drug test and possiby random test. I really need Rating: 5