Battery powered drill and all the other tools that take a rechargeable battery pack.

An adjustable wrench in the floor of every tractor, truck , sprayer will see a lot of use and get you out of a jam. Use it on nuts bolts hydraulic fittings etc.

Hammer
Pipe wrench
Pry bar

30 years ago my wife gave me a Super Leatherman.

I wear it every day, use it most days.

WS

most taken for granted , by people who don't know what they are

all those blocks of wood cut to the perfect size to do whatever it was you needed , like removing the mower blade.

4 wheeler

Leatherman, I think I've got more now than I've lost or broken.

Get some at work for safety awards, and gifts from family.

Found one today at estate garbage sale, for $3.00

a torque wrench . really helps to torque things the way they should be.

my cordless Milwaukee right angle gen 2 die grinder has been extremely helpful in cleaning up parts and corrosion on parts that would have taken a LOT longer just trying to get clean with out it.

need a clean surface to get a good seal.

It's a toss up between a four-wheeler and a pocket knife

Ol dad

I find dykes very useful. The diagonal cutting pliers, not Rosie O'Donnell type lesbians.

Keith

Cell phone and Internet.

well pump, wheels and tires, any motor, hvac units, nuclear bombs

I find the rosey oDonald type useful for removing some from the gene pool.

My Honda Foreman and an air compressor.