Klein Tools Circuit Analyzer RT390 120V Outlet Tester (Color LCD Display Voltage Drop 12A 15A 20A Load AFCI GFCI Trip Time Dual Open Fault Diagnosis)

Evaluate Percentage Voltage Drops Under Simulated Loads And Diagnose Safety Circuit Breaker Interrupters Instantly With Color Digital Screen Telemetry

The Klein Tools RT390 is a handheld digital circuit analyzer engineered to evaluate the systemic health of North American 120V AC 3-wire electrical receptacles. This test instrument maps percentage voltage drops under simulated 12A, 15A, and 20A current loads to immediately pinpoint high-resistance connections and loose terminal wire links before overheating occurs. Operating inside a certified CAT III 135V safety envelope, the device employs a high-resolution full-color LCD to display real-time AFCI and GFCI trip time and current values while unmasking complex simultaneous open neutral and open ground wiring errors.

Best Used For:

• Simulated Load Balancing: Testing structural branch circuits under real-world 12A, 15A, and 20A draws to diagnose voltage drop issues caused by long copper wire runs.
• Arc Fault Interrupter Audits: Measuring and logging the exact trip time duration and active current required to open AFCI and GFCI breaker safety mechanisms.
• Complex Wiring Interrogations: Isolating elusive multi-wire dual-open neutral and ground errors inside hidden residential or commercial electrical gang boxes.

Key Performance & Safety Features

• Full-Color Screen Metrics: High-resolution digital display populates sharp visual text panels, wiring status maps, and timing logs for efficient troubleshooting.
• Multi-Tier Load Testing: Automatically calculates voltage drop variance percentages across standard power branches to locate failing terminal splits.
• Advanced Safety Device Profiling: Drives isolated electronic simulations that trigger safety interrupters, reporting millisecond and milliamp metrics.
• Detachable Power Cord: Removable testing line configuration minimizes storage box space constraints and eliminates sharp conductor bending wear.
• Hardened ABS Plastic Housing: High-impact external structural molding passes verified drop protection validation testing on flat concrete surfaces from up to 6.6 feet.

What's Included

• RT390 Digital Circuit Analyzer
• Detachable Electrical Testing Cord
• Three AAA Alkaline Batteries
• Protective Storage Pouch
• User Instruction Manual

Technical Specifications

Pro-Tip: When evaluating high voltage drops on a branch line, test the outlet closest to the breaker panel first; if that reading also indicates an excessive percentage drop, the issue stems from a loose connection wire nut or lug right on the main bus panel box.