A Coulombmeter is used in combination with a Faraday cup or a metal probe for taking charge measures of a material.
[1] A Nanocoulombmeter is a Coulombmeter that is capable of measuring electrostatic charge down to the accuracy of a fraction of a nanocoulomb (nC).
This application of a coulombmeter is useful because electrostatic discharge is a leading cause of failure in semiconductor chip designs, and may occur during the fabrication, inspection, assembly, and other processes.
A coulombmeter allow this electrostatic buildup to be easily measured simply by applying the instrument's probe to its lead.
[2] Note: coulombmeter is typically written as a single word in order to avoid confusion with the measurement unit 'coulombs-meter' and also to make it easily searchable in scientific literature.