The Klein Tools RT390 Circuit Analyzer is a powerful, all-in-one diagnostic tool designed to test and troubleshoot electrical outlets with accuracy and ease. Built for electricians and advanced DIY users, this analyzer provides detailed insights into outlet wiring, voltage levels, and safety device performance.

Featuring a large, color LCD display, the RT390 delivers clear, easy-to-read results for fast and reliable diagnostics on North American 120V AC 3-wire outlets.

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Key Features

• Outlet Wiring Tester – Detects common wiring faults quickly
• AC Voltage Display – Shows real-time line voltage readings
• GFCI & AFCI Testing – Inspects devices and measures trip time
• Voltage Drop Testing – Tests under 12A, 15A, and 20A loads
• Large Color LCD Screen – Easy-to-read, user-friendly interface
• Advanced Diagnostics – Helps identify electrical issues efficiently
• Designed for 120V Outlets – Compatible with North American 3-wire systems

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Product Specifications

• Model: RT390
• Type: Circuit Analyzer / Outlet Tester
• Display: Color LCD
• Voltage Compatibility: 120V AC (North America)
• Functions: Wiring test, voltage display, GFCI/AFCI test, voltage drop test
• UNSPSC: 41113642
• UPC: 092644693632