Supplies

Short answer: strips or drops are enough for most Kratky growers, because you mainly check pH at mixing time. A meter is more precise and easier to read, but it needs regular calibration and care. Test strips Pros: cheap, simple, nothing to calibrate Cons: colors can...

Short answer: not strictly. Following the label rate carefully can grow a good crop, and UF/IFAS treats a meter as optional for Kratky growing. But a meter is the only way to know the real strength of your solution, and it makes problems far easier to diagnose....