These are very cool. <a href="https://www.spielzeug-meiners.de/marken/simba-dickie-baby-und-kleinkind-holzspielzeug-142/simba-dickie-100039038-heros-constructor-170-tlg.-1cvz.html" rel="nofollow noreferrer">https://www.spielzeug-meiners.de/marken/simba-dickie-baby-un...</a> fun to see kids learning how to use a wrench and screwdriver and washers.
A cheap micrometer, and some simple hand tools for working with metals, plastics, etc. Files, screwdrivers, rulers, etc.<p>An Arduino starter kit with plenty of servos, sensors, etc. All run off a few batteries, and relatively safe.<p>It's amazing what kind of instrumentation you can get for less than $100 these days.