Fill a test-tube halfway with nutrient, add a few drops of pH Test Indicator, and observe the coloration of the liquid in the test vial. Use 3 drops per 5mL of solution.
- Tech Specs
Brand General Hydroponics SKU HGC722140-PCK Weight (lb.) 8.4 Prop 65 No Lead Time This product ships in 7-10 Business Days UL Listed No Shipping Restrictions AK, HI