Regolith, the layer of boulders, rocks, and dust that covers space bodies such as asteroids, is a significant area of study because it has implications for landing craft and exploration. Some asteroids are notably devoid of fine dust, with regolith dominated by particles 1 mm and larger. Simulations have shown that electrostatic repulsion can produce sufficient force to eject fine regolith from asteroids, which generally have low gravity (Hsu 2022). In this project, we aim to develop an experimental setup that can test this hypothesis using the drop tower at Portland State University. The drop tower will allow us to look at electrostatic interactions between charged particles in a low-gravity environment. A necessary first step towards this goal is the design of sensors that can measure the charge on small particles. Here, we describe the design of a charge sensitive amplifier and Faraday cup capable of measuring charges on micron to sub millimeter particles. To benchmark our system, we use acoustic levitation to suspend particles and electrify them. Then, we use our sensor system to measure their charge. As a starting point, we use water droplets to demonstrate the capabilities of the test setup. While future experiments will focus on silicate materials, these preliminary experiments with water inform electrification processes on other worlds including Titan, and provide insight into the fundamental physics of particle electrification. Our results demonstrate the flexibility and sensitivity of our levitator-electrometer setup, and show that it is capable of carrying out further experiments in regolith triboelectrification.