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  1. M

    Very different pH readings?

    Hi, I have PH indicator drops and that simple PH meter with one node that does not need calibration. Big difference in readings. Drops are like a year old... would that impact the way they work? Should meter at all be used to measure water PH? I have AD12 coming in next week but...
  2. B

    Need help with LED lux reading - Please help

    I have one MarsII 5watt diods-400 watt LED full spectrum light. I need to know what is the correct lux light meter reading for growing in a 3x5-1/2 ft sq tent. The lux meter is reading at 29 to 30,000 on two plants that are just over a week old. Is this the norm or is this too much light...