Our Electrostatic Probe Controller is for Langmuir probe diagnostics in fusion plasma. The Electrostatic Probe Controller can provide a bias excitation of up to ±200 V and 4 A. The Electrostatic Probe Controller is equipped with an Arbitrary Waveform Generator, which allows users to set the form, frequency, offset, and amplitude of the excitation signal as needed. The Electrostatic Probe Controller can complete isolated detection of probe voltage and current signals.