I, like many, already do this. I just use my reg. Ball jars and a quarter sized hygrometer which gives me an accurate reading in about 15 min. I just pulled a few premies and the Gorilla Bomb had 80+% moisture while the Girl Scout Cookie 70% (identical start, treatment etc). This after a 6 days hanging in my cellar. So I had to leave the GSC jar open and the GB spilled out on a mag. to dry a while B4 re-bottling and daily racking. Just wish I could have known not to jar quite yet. Instead, I went by the stem method (bottle when branches MAKE AN ANGLE THAT STAYS when bent) I was lucky to have the timing work out such that the premature plants early pulling coincided with their replacements maturing so the replacements went right into the premies holes (after re-charging). I have no complaints as the early flowered few made timely room for replacements while offering some early season enjoyment. Check the pictures! The Gorilla Bomb is really coming up roses!!