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I have recently switched from numerous digital ph pens to the ph drops from General Hydroponics. I've noticed after 5-10 minutes the colour changes from when it is first tested. Are you supposed to read the colour as the drops are added or do you wait until the vile has stopped changing colours...

So this is the room, sorry about my poor paint skills. I have been pondering what would the most efficient way of running the ducting in this room as the middle of the aisle can reach up to 90-95 degrees while the walk way in line with the chiller will be about 72. feel free to leave any...