Wikipedia
A Coulombmeter is a tool for measuring the electrostatic charge of a material. A Coulombmeter is used in combination with a Faraday cup or a metal probe for taking charge measures of a material.
A Nanocoulombmeter is a Coulombmeter that is capable of measuring electrostatic charge down to the accuracy of a fraction of a nanocoulomb (nC).
Electrostatic charge on an object can be measured by placing it into the Faraday Cup. The charge is transferred to the cup and displayed on the meter's display. The Faraday Cup of the Coulombmeter has an outer, grounded metal shield that surrounds an inner electrode. The inner electrode, which is electrically isolated from the shield, is connected to a meter to measure the charge.
In the field of semiconductor design, a coulombmeter consists of a meter used in combination with a metal probe tip to pinpoint locations of excess charge on for instance a semiconductor device. This application of a coulombmeter is useful because electrostatic discharge is a leading cause 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
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.