The post with scale can be laid down without altering volume settings. The precision parts of the glass in constructed and protected on the inside. The liquid contact parts are chemically resistant. The parts can easily be dismantled and changed. Liquid can be added with the funnel without changing the setting of the device. The extension tube with tip allows dispensing to be done without moving the device or sample bottle. Please use a PTFE (Fluorine resin) tube set with tip (sold separately) for strong acids and organic solvents. Autoclavable without disassembling.