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Description
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
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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 25 reviews
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Product Reviews
★★★★★ 5
Exceptionally Clean Taste and Reliable Hydration
Size: 12 Fl Oz (Pack of 12), Number of Items: 12
I’ve tried a lot of bottled waters over the years, and Essentia consistently stands out. The taste is incredibly clean and smooth—there’s none of that mineral aftertaste you sometimes get with other brands. It genuinely feels more refreshing, especially after workouts or long days.
What I appreciate most is the consistency. Every bottle tastes the same, and you can tell there’s a strong focus on quality. The higher pH and added electrolytes seem to make a difference in how hydrated I feel compared to standard bottled water.
The 12 oz size is also convenient—easy to grab on the go or keep at your desk without committing to a larger bottle. And knowing the bottles are BPA and phthalate-free is an added bonus.
Overall, it’s a premium water that delivers on its promise. Definitely worth it if you’re looking for something a step above the typical bottled options.
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Reviewed in the United States on April 13, 2026
★★★★★ 5
Life-changing Water. Extreme statement, noted, try it & you'll get it. Kids prefer it over soda? A+
Size: 42.3 Fl Oz (Pack of 12), Number of Items: 12, Size: 42.3 Fl Oz (Pack of 12), Number of Items: 12
This is by far the best tasting water that I have ever had. When I'm really thirsty, there is only one thing that I can really take in a good amount of and not feel nauseous and that's slightly chilled Blue Gatorade. But with the Essentia, I can drink the whole 1.25L bottle in one go and actually feel satisfied.
The Gatorade will give me heart burn, but the Essentia does the opposite because of its high pH, making it a base. It will relieve heart burn, it will satisfy thirst, and after the longest time of our kids drinking the filtered water from the fridge, they have start begging us if they can open a bottle of Essentia to split between time. They like it cold like mom though.
I'm the only one that drinks it warm and maybe I'm the weird one, but I truly enjoy it. We've been drinking it for over a year now and feel great. I highly recommend it and suggest buying the 12x1.25L or 12 by 1.5L (in the rare cases they come up) cases. The size is convenient, it doesn't get that stale taste if you forget to put the cap on for a little while, and it's just an enjoyable way to get your daily water intake.
As for the health impact, many bacteria, diseases, and even cancer, etc which I'm, thrive in an acidic environment, after 3 months of drink Essentia and a pH test, I'm at about 8 on the pH scale and have stayed that way. Just for a refreshed 0-6 is acidic, 7 is neutral, and 8-14 is alkaline or basic. Knock on wood, but I have not but I have not been sick in 3 years, just check up visits and I'm a cancer survivor in remission for 13 years now. I cannot tell you exactly when we bought the first bottle in the super-market, but it has been easily 3+ years now.
A+ and a continued customer for sure. I also like that they literally fill the bottle to the top, to where you have to carefully unscrew the cap without it spilling. That says something about the company, not trying to save the ounce of water at the top of the bottle and fill it with air.
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Reviewed in the United States on October 3, 2025
★★★★★ 5
Love this water! Here's why!
Size: 42.3 Fl Oz (Pack of 12), Number of Items: 12
I am pretty picky about bottled water. I will only drink black capped water as white caps make me very ill and blue caps don't have the taste or quality of black caps (the color of caps indicate how it is collected and process). Of all the black caps, Essentia is my favorite brand. I love the strong, sturdy bottles, and prefer the larger size to help me remember to hydrate. Most people don't feel like water has affects like coffee or energy drinks, but this water is clean and provides me with a boost of alertness.
In terms of the value, I think it's definitely overpriced. I don't believe water should come at such a high price, yet I still pay for this brand because of the taste, the enjoyment, my energy levels and how clean it tastes going down. And it doesn't make me ill.
If you're new to understanding water, pH balances, and how water is different based on how it is processed, give this a try and experience the difference of it's effectiveness.
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Reviewed in the United States on February 3, 2026
★★★★★ 5
Good Water
Size: 33.8 Fl Oz (Pack of 12), Number of Items: 12
Good price. Love this brand of water - no after taste. We even use the water in our ice maker :) as well as making lemon and cucumber water for hydration and a refresher.
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Reviewed in the United States on May 3, 2026
★★★★★ 5
My Son's Favorite
Size: 42.3 Fl Oz (Pack of 12), Number of Items: 12
My son loves Essentia, and it's the way I can get him to drink water instead of sugary drinks. Essentia puts together an attractive package, too. The black boxes are instantly recognizable, and the bottles actually in drink holders in our car, making portability a big plus, for us, considering he goes around with a bottle most everywhere we go. For him, he says it's the best-tasting bottled water on the market, and its quality is instantly noticeable in comparison its competitors. It keeps him hydrated, and he prefers it to such a degree that we've started buying it by the case.
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Reviewed in the United States on May 1, 2026