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I have the red Hanna Checker ph meter. I keep the 7.0 buffer solution in the cap per the instructions. Now, every time I go to use my meter I have to calibrate it. The 7.0 range is always about .20 high and the 4/10 is constantly about .10 high(4.01 sol.) 6.59ph regestered at 7.62ph. The...

When I checked on my seedlings this morning one of the seedlings stem was bent in half. I propped it with a tooth pick and thread lightly tied. Fan was blowing onto the light and bouncing off back of tent. Will it survive? super cropping for toddlers?:dunce:

I scored a roll of mylar from a homeowner taking down the tenants grow room. Unfortunately he was keeping all the good stuff. But it is silver on one side and gold on the other. Now high school science tells me that a red shirt reflects red and absorbs all the other colors. Does that mean the...

Soon I'll be ready for my first test run. When I test the operating temp should I use the MH or the HPS or should I test both for a full cycle?