The answer will depend on what attribute of the hammer: its mass, weight, length, etc you wanted to measure.
the best unit of measurement to use to express the mass of a small novel would be grams
Which of the following would be an appropriate scale of measurement for a small scale map showing a large region :
you would use a ruler.
A very small measurement woulld be helpful. I would try the ounce.
Hinge pins are best removed by a small screwdriver or nail and a hammer. Put the nail or small screwdriver on the hinge pin, opposite of the head, carefully hit the nail or small screwdriver with the hammer. Hammer harder for a more difficult pin.
Millimetre.
you would measure heat with a thermometer
inches because there small enough
a gram
meters
The cat's paw and nail puller are mostly for small nails with small heads. The claw of a hammer is mainly intended for construction 'spikes'.
You would rather use 1g