Scout 10, 8" (capacitors, circuit board shielding box, plastic dome, metal springs, roller blade bearings,  etc.)

When exploring other planets looking for resources, friends or foes who are you gonna call t check the situation out first? That's right, send in Scout 10 for all that preliminary dirty work. Able to withstand any atmosphere and submerge to any depth on a water world, Scout 10 will find what you're looking for.