Ideal instrument when high ranges are needed for measuring insulation resistance. Provides excellent test voltage regulation and an external guard terminal to eliminate surface leakage current from the measurement.

• Multiple test voltages
• Guard terminal to eliminate surface leakage current
• Voltage indicating range

The instruments are all electronic; they generate a regulated dc high voltage and use low-zero-drift, high-accuracy circuits, with high current sensitivity. Designed for portability, each is enclosed in a molded, impact-resistance, flame-retardant case.