The mechanic creeper is a tool used by auto mechanic, a low profile, wheeled platform whereupon one may lie supine and gain better access to under body of a vehicle.
In principle, the hydraulic jack is based on Pascal principle, that is, the pressure of the liquid is the same everywhere, so in a balanced system, the pressure exerted on the smaller piston is relatively small, and the pressure exerted on the larger piston is also relatively large, which can keep t