Testing your Brix level in your plants will tell you quite a bit about your plant health, soil or growing medium efficiency, as well as help you determine the effectiveness of your foliar feedings. Needed: a refractometer, a plant leaf sample, pliers or a garlic press, distilled water, a microfiber cloth, a pipet. A Higher Brix level = healthier plants, higher mineral density, higher sugar levels, 12+ brix is a natural pest repellant, better flavors. Higher Brix vegetables usually taste sweeter,