If you are on municipal water you can get a water quality report online. We are interested in the water hardness and sanitation sections. The Blue lab EC pen will not measure below 50 PPM
You might benefit from this:
The proper use of “salt” based fertilizer to grow Auto Flowering Cannabis. Salts: Natural and man made any chemical compound formed from the reaction of an acid with a base, with all or part of the hydrogen of the acid replaced by a metal or other cation. Learning how to use salt based...
www.autoflower.org
The plant should make it easily to harvest but you need to let the pot cool down. It would also help if you did a onetime foliar feed of Kelp, Fulvic Acid and B-vitamins or Earth Juice Microblast.