Fill a test-tube halfway with nutrient
Add a few drops of pH Test Indicator
Observe the coloration of the liquid in the test vial. Use 3 drops per 5mL of solution

Technical Details

Size (LWH): 5.8 inches, 2 inches, 1.9 inches
Product Details
Product Dimensions: 5.8 x 2 x 1.9 inches
Shipping Weight: 0.6 pounds (View shipping rates and policies)
ASIN : B003Y3F34I