Pharmaceutical density meters are useful in evaluating the material porosity of a solid drug substance or determining the specific gravity of liquid samples. Pharmaceutical density meters include pycnometers, which measure absolute, envelope, and bulk density. Pharmaceutical density measurements factor for the solid volume of the sample material or they factor for the pores on the surface of a substance. Evaluation of density is useful for meeting quality control standards and examining the final state of a solid or suspended formulation. Purchasing considerations for density meters include the state of the material to be tested, the operating temperature range, the unit size (benchtop, portable), and capacity/range of volume that can be measured.