My meters are shit and I'm sure don't read right(chinese clone shit) On average about 76/78 give or take a couple. It will read humidity if I mist in the tent.
And its not that hard to believe the humidity is less than 10% as the tent is constantly vented so no moisture. and this I am certain is the problem but as I stated already I am open to suggestions.
The plants are in 3 gallon buckets I water them two liters every third day and one liter a week when feeding so 5 liters of water a week.