Purpose: Disposable pipettes are designed for solitary-use applications to stop cross-contamination and simplify lab work. Double-Action Only (DAO) Pistol: A DAO pistol is the same as a DA pistol, other than the trigger cocks and releases the hammer For each and every shot and also the hammer can't be manually https://tysonscjov.kylieblog.com/29874314/about-types-of-pipettes-in-chemistry