Click to expand Tap to zoom Plastic Hydrometer Test Jar SKU 444CEC 5.0 / 5.0 3 Reviews Original price $6.95 - Original price $6.95 Original price $6.95 $6.95 - $6.95 Current price $6.95 | / Quantity Add to cart A plastic tube to test the specific gravity of your brews. Makes it easier to measure rather than dropping the hydrometer directly into your fermenter.