The Klein Tools RT390 is a Circuit Analyzer that tests the wiring conditions at an electrical outlet, displays AC line voltage, inspects AFCI and GFCI devices with time to trip device, and performs voltage drop tests at 12A, 15A and 20A current loads. Results are easy to understand with large, color LCD. The tester is designed for use with North American 120V AC 3-wire electrical outlets.
Test Wiring Faults, Inspects AFCI and GFCI Devices, Displays Line Voltage, Voltage Drop
UPC
092644693632
What's Included
3 x AA Batteries, Instructions, and Pouch
Packaging
Retail
California Residents
Proposition 65 Warning
Physical Characteristics
Material
ABS Plastic, Overmold, Electronic Components
Length
1.5'' (17.9 cm)
Width
2.7'' (6.9 cm)
Height
7.1'' (3.9 cm)
Weight
0.31 kg
0.68 lb
Details
Measurement Standard
CAT III 135V
Features
Circuit Analyzer with large color LCD displays easy to understand results for wiring faults, AFCI, GFCI, voltage drops and time to trip devices Detect and identify common wiring faults in standard, AFCI and GFCI electrical outlets Detects dual (open neutral/open ground) wiring faults Inspect AFCI and GFCI devices; includes trip time and trip current 12A, 15A, and 20A load testing to measure percentage voltage drops Powers off automatically after 5 minutes of inactivity to conserve battery life Detachable cord for easy storage For use with North American 120V AC 3-wire electrical outlets Safety Rating: CAT III 135V
Klein Tools is the result of one of those “happy accidents” that turn out to be revolutionary. Klein Tools famously got their start in 1857 when a linesman came to founder Matthias Klein to repair his broken pliers. Klein replaced the broken half and when the old half of the tool broke too, Klein forged a replacement for that, thus making the first Klein Linesman pliers. Since these humble beginnings, Klein Tools has grown and become one of the largest American made toolmakers and they’re a brand used by tradesmen, linesman and electricians all across America.
Customer Reviews
Overall rating: 4.8 / 5 from 12 reviews.
This is a very good device that is easy to use and performs reliably. When compared with a Fluke 85V reference meter, I noticed the voltage reading was approximately 2 volts higher than the actual value. Despite this slight variance, it remains a useful and dependable tool for general testing and everyday applications.
This tester works great and is a must have for anyone doing home electrical work It’s reliable, easy to use, and gives confidence when checking circuits and connections
A great analyzer for inspectors and other professionals It’s a well built unit capable of testing circuit functions, wiring, and both GFCI and AFCI performance The large, bright display is easy to read, with clear color indicators that quickly highlight issues like improper wiring Overall, it’s a reliable and practical tool for thorough electrical testing
This tool takes diagnostics to the next level with its fast, quantitative voltage drop testing feature. In just a few seconds, it accurately verifies circuit integrity, making troubleshooting quicker and more reliable. It’s an excellent feature that adds real value for both professional electricians and advanced DIY users.
This tool has a bit of a learning curve, and getting the most out of its features requires some technical knowledge. However, once you become familiar with it, it proves to be an extremely useful and capable tool. It's well worth the effort for anyone who wants to take advantage of its full functionality.
This circuit analyzer works exceptionally well It’s easy to use and delivers clear, accurate readings every time The large LCD display makes it simple to quickly identify wiring faults, and the GFCI/AFCI testing feature is especially useful in the field Overall, it’s a reliable, professional grade tool that I would highly recommend
A high quality product and an excellent choice for anyone looking for reliability and performance. It works as expected, is well made, and offers great value. Highly recommended.
The tool works well and performs its intended function reliably. While the quality and performance are satisfactory, the price feels a bit high for what it offers. If I ever need to replace it, I would likely consider a more affordable alternative that provides similar functionality.
One of my favorite features of this tool is its voltage drop testing capability. It makes diagnosing electrical issues much easier and adds significant value beyond basic testing functions. A practical, reliable feature that enhances the overall usefulness of the tool.
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