Artificer's tools include a small saw, hammer, files, pliers, narrow-bladed scissors, tweezers, and a small crucible and molds for casting gears and other clockwork components. They also include an array of crystal and specialized equipment for channeling magical forces.
Proficiency with artificer's tools provides you with more information on Arcana checks involving constructs and magic items with complex mechanisms.
Your knowledge of mechanical engineering grants you additional insight when answering questions about the origins of such devices.
This tool proficiency can aid in identifying a mechanical trap and determining how it functions.
With two days of downtime, a set of artificer's tools, and 10 gp worth of materials, you can work for 8 hours each day to craft a complex clockwork mechanism or device. Some examples of what you can make are: an alarm, a calculator, a clockwork toy, an igniter, a pocket watch, or a music box (though you must also be proficient with Performance checks or a musical instrument to craft this item).