Engino STEAM Labs：油圧の仕組み、STEM組み立てキット（8歳以上、4モデル）

My 9-year-old spent two hours building the crane arm and kept saying "watch this" every time he pumped the lever. The syringes and tubing actually hold up to repeated use, which I wasn't expecting from a kit in this price range.

My 9-year-old spent a solid hour building the crane arm and couldn't stop showing everyone how the piston lifted it. I like that it comes with four different models, so there's still the excavator and platform left to try. Way better than the other building sets that just sit on a shelf afterward.

The syringe-and-tube setup actually squirts water to move the little arms, which hooked my kid way more than a screen would. Took us about an hour to build the first model, and the instructions were clear enough that he did most of it himself.