measurements

Just wanted to know peoples thoughts and opinions about testing run off water - especially for ec - I watered last night and thought I would check the ec of run off and it came out to 5.9. In soil plant looks nice and green, had acidic soil for the past week but just corrected this problem...

Hey Everyone, I am wondering if anyone has any suggestions of Data logging and monitoring equipment for grow rooms. What I am looking for is a device that measures humidity, temperature, co2 that has data collection that can either be connected wifi or cat5 cable to a computer or network for...