Superior strength garlic crushers used for extracting juice from plants for placing on your refractometer prism to measure the plants brix levels. These garlic crushers will even crush avocado leaves.
Place plant sample in the garlic crusher. Press the garlic crusher gently until a drop of juice is seen forming at the base of the garlic crusher (it is usually easier if you hold the garlic crusher on an angle so all juice droplets form at the same place on the crusher). Place the juice droplet onto the prism of your refractometer to take brix reading.