At around $700 this is probably alot more than your looking to spend but heres a Fluke tester that does what you want.


http://us.fluke.com/usen/products/Fluke+VR101S.htm?catalog_name=FlukeUnitedStates

Heres a cheaper one...

http://www.acscout.com/servlet/.1608ccc1/Page?template=productinformation