Simpson’s Model 501 is the newest addition to its insulation tester family. The Model 501 can 
be used for general purpose insulation tests that require voltages from 50 V to 1000 V only. 
Additionally, this instrument is equipped with AC and DC for the absence of voltage and the 
discharge of capacitive devices under test. 

The Model 501 features a quick testing signal lamp within the test probe that serves to 
illuminate the work area. The signal lamp can also be used for quick Pass/Fail evaluations of 
insulation resistances. Minimum values for insulation resistances arepresent if the lamp lights up. 
Each tester comes equipped with built-in test probes, one alligator clip, a leatherette carrying
 case and batteries.

• Five Test Voltages: 50, 100, 250, 500, and 1000 VDC
• Voltage Measurement to 1000 V AC/DC
• Test Probe Signal Lamp Illuminates Work Area and Indicates Pass/Fail of Insulation Resistance
• Rugged Tester Design for Industrial Applications with Leatherette Carrying Case
• Battery Powered, with Battery Test and Battery Charge Indicator

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