• Chopper probe is DC-stable with or without incident air ion flow
• Drift-free measurements
• LCD screen displays present voltage and holds the most positive and negative values
• Visual and audible alarms activate when the preset voltage threshold levels are reached
• Voltage output monitor for remote monitoring or control
• USB and RS-232 serial ports
• NIST-traceable Certificate of Calibration provided with each unit
• Optional Walking Test Adapter kits available