Portable non-contact design: Handheld and lightweight for easy use on the go,enabling non-contact measurement of surface electrostatic values and ion balance wherever needed. Precise stable measurements: Offers a measurement range of 0~20KV at a standard distance of 25mm. Constructed with conductive anti-static housing and a built-in grounding clip to reduce interference,ensuring accurate results. Clear dual-color LCD display: Displays real-time values with red indicating positive charge and blue indicating negative charge,featuring a refresh rate of 5 times per second for easy observation and data logging. Intuitive one-step operation: Point the tester and adjust until the two LED projections overlap to achieve the correct distance of 25mm,allowing for immediate readings without complex setup. Versatile professional tool: Suitable for quality control,electronics manufacturing,industrial maintenance,and laboratory settings to monitor electrostatic discharge risks and assess ionizer performance.