The portable electrostatic tester is a professional electrostatic protection detection tool for scenarios such as electronic manufacturing and precision machining, capable of precisely controlling electrostatic potential and ion balance. It boasts a 1-second quick response capability, capturing electrostatic changes in real time. The wide-screen bar graph visually displays positive and negative potentials, providing clear readings. Equipped with LED focusing and positioning function, it ensures a standard test distance of 25mm, delivering accurate and reliable data. Additionally, it supports professional functions such as peak holding, ion balance testing, and zero calibration. With its compact and portable design, it can be operated with one hand, making it an ideal portable tool for enterprises to ensure product quality and production safety.