The effective power of a geologist's hammer is mainly considered to be a reflection of its head weight and handle length. Head weight may range from  or less on a small hammer—such as would generally be used for casual use or by children—to  and greater.
The effectiveness of a geologist's hammer is primarily determined by its head weight and handle length. Head weight can vary from  to  on a small hammer, which is typically used for casual use or by children, to  and more on larger hammers.