The 550 is used to check high voltage circuits on Hybrid cards for leaks to ground. The 550 can supply 250V, 500V and 1000V test voltages for doing complete insulation testing. You can not easily test for high voltage leakage without a high volt test source. The 550 is auto-ranging and can measure up to 2000 MegaOhm with a resolution of 1 K Ohm.
Warning: This product may expose you to chemicals including lead which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov