The Barfield 2471F megohmmeter tests the insulation breakdown in a   variety of applications that require high voltage and low current. It is  a simple, rugged, portable, analog unit with selectable test voltages of 45, 100, 200, and 500 VDC. The range of test voltages allows the user  to quickly test and pinpoint insulation breakdown over a range of 0.5  to 1000 Megohm. Designed for safety, this device uses current limiting  circuitry and ensures user safety even in the 500 volt range since the  maximum allowable test currents are well below human sensitivities.  Additionally, this device is protected from damage caused by inadvertent  connection of the probes across an energized circuit - AC or DC  voltages up to 300 volts can be safely applied.

• Selectable test voltages 45V, 100V, 200V and 500V

• Battery operated with no warm-up time needed - uses "C" and "AA" batteries with auto-off feature to conserve batteries

• Equipped with a meter scale with increments from 0.5 to 1,000 megohms

• Solid-state circuitry

• Hand-held and portable

• Push-button activation on the test probe

• Absolutely no shock hazards

• Sensitive operational amplifier