During hydroponic testing there is a need to sustain optimal PH, electrical conductivity (EC) and temperatures to create the perfect environment for the proper growth and overall health of your plants to provide the best quality crops with higher potency and larger more robust yields. The Bluelab combo meter can test the conductivity, PH level and temperature all in one easy to use meter. Conductivity tests can give you the ability to check the soluble salt levels within your nutrients to prevent root burn and feed amounts and is imperative to overall health. Controlling the PH levels within the medium is important for nutrient uptake to be optimal. The use of Essentials PH up and PH down can help you regulate your grow medium to what is the perfect level for your plants. Use Essentials Buffer 7 or Essentials PH 4 for testing your Plantit Digital PH Meter or Bluelab Combo or Truncheon meters. The use of hydrometers, thermometers and nutrient meters are of great importance to give your plants the best environment to thrive.