L-K Industries oil centrifuge tubes come configured with either a cork- or rubber-tooled top, or a wide- or standard-thread top. The tubes feature 2-mm thick wall configurations offering durability and high RCF capability.The glass tubes come with standard or detailed permanently etched graduated markings. Tubes with detailed markings are ideal for test sites or wells that produce more water than what is typical. Ideal for use in regulatory environments Unique serial number on each tube provides precise traceability . Permanently etched graduated marks improve visibility. Sand spot simplifies marking tubes in the field and lab