Home test kits worthless?
Many believe that, but even more reefers use them and are just fine with it.
A substantial percentage of male are colorblind and a much smaller percentage of female are.
Establish first if your eyesight is suitable for the use of those testkits
Read more about it:
http://colorvisiontesting.com
Do the test:
http://colorvisiontesting.com/ishihara.htm
mobile app
http://www.colorblindcheck.com