Ah. So a sensor and not really controlling anything then. Thought maybe it metered out pH or nutrient stuff.
Don’t freak about pH. Let it move around but keep it in the range of about 5.5 - 6.3. You’ll have to keep an eye on that with the GH/Monsanto/Scotts/Bayer stuff you have. I bought gallon jugs of AN for $40 each about 5 years ago and have about half left. $44 for the jug of Micro.
Make sure to have proper pH Up and Down too. I only ever had to use pH down when using the AN nutes before they came up with the pH Perfect tech but that was some years ago. I use concentrated, 96% sulphuric acid and 4 or 5 drops in a 50L tub was enough to drop the pH from 6.3 down to 5.5 or lower and only needed that every 3 days when I did top-ups and testing for pH and ppm. I’ve done about 50 DWC grows since 2001. Mostly growing in soilless ProMix HP these days.
What are you using for lights?
