for almost the last two years I have used these guys for gender detection early within 20 days of sprouted seed growth. Their success rate is beyond reproach.
It's nice to know you could free up your resources, electrical bill, and grow time from seed before they are even three weeks old. cull ur males and move on at Day 17 ! They are a great company to work with customer service over the phone if anything goes awry.
We are getting tested
Send smashed catylone sample in mail
Lab results within 5 days to ur inbox profile