June 24, 2013

Klein RT600 GFCI Receptacle Tester - Review


Last week we looked at the bottomless well of confusing functionality that is the Klein MM5000 Multimeter (confusing because we're not that smart, not because of anything Klein did), but today we're checking out their latest GFCI receptacle tester, a much more friendly item to the electrically clueless.

The receptacle tester is about as easy to use as a tool can be. It's a little unit, about the size of a fat matchbox car with a three prong plug sticking out of the back. Just plug it in an outlet and it tells you what, if anything, is wrong with the wiring. The status is communicated through a pattern of display lights. Printed right on the tool is a diagram of what all of the different patterns mean. Very handy and really easy. Even we can do it.


The tool is designed to handle all of the common problems in standard 120V receptacles. Through the three indicator lights (two orange, one red), the tester can diagnose:

  • Open ground

  • Open neutral

  • Open hot

  • Hot and ground reverse

  • Hot and neutral reverse

  • Hot on neutral with hot open

  • Correct wiring

You can also check the GFCI with a little button.

It's a handy little item and being able to tell all of this about an outlet just by plugging something in is really nice. Because of its size, it can fit in a pocket or in the outside pouch of any tool bag.


I took the tester with me on a recent real estate outing (looking at a house for ma and pa ToolSnob) and when no one was looking I tested a handful of outlets. I ended the day content with the wiring in the home. It would be a good item for any home inspector, service tech, or anyone who deals with old homes on a regular basis (before we gutted it, ours was filled with way too much DIY wiring, like this horrifying example).

$33 at Amazon

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Posted by Doug Mahoney at June 24, 2013 6:49 AM
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