Which implement would typically be used for precise liquid measurements?

The dropper is the implement typically used for precise liquid measurements because it is specifically designed to dispense small, controlled volumes of liquid. It allows for accurate measurement and is often utilized in laboratory settings, medication dosing, and culinary applications where exact amounts of liquids are required. The dropper's design facilitates the ability to measure and transfer small quantities effectively, which is essential in contexts where precision is crucial, such as administering medicines or performing chemical experiments.

In contrast, tweezers are used for gripping and manipulating small objects rather than measuring liquids. A scalpel is a sharp instrument intended for cutting, commonly used in surgical settings, but it does not serve a measuring purpose. Meanwhile, a ruler is primarily used to measure length or distances, making it unsuitable for liquid measurement tasks.