KLEIN TOOLS RT390 Circuit Analyzer
with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time
Price as of 2026-06-16. Check Amazon for the current price.
Quick Decision
Price Intelligence
- Budget:$6–$14
- Mid-range:$14–$53
- Premium:$53+← You are here
Is This Right For You?
- •Buyers who prioritize quality over price in testers
- •Those who want a top-rated option — in the top 2% of testers by rating
- •KLEIN TOOLS loyalists — the brand spans 66 products in our database
- •You're on a tight budget — $105 above the category average of $55
- •Fluke -101 Digital Multimeter — 57% cheaper at $69 (Score B)
📊 Based on data analysis of 185 products in this category.
Mubboo Score: C+
How we calculate the Mubboo Score
Quality (45%): customer rating, normalized to a 10-point scale
Popularity (35%): review volume vs the category leader, log-scaled
Value (20%): price position vs other testers
Computed from live Amazon rating, review count, and price across 185 testers available to US consumers · last refreshed 2026-06-16.
How It Compares
This Product KLEIN TOOLS RT390 Circuit Analyzer | Most Popular KLEIN TOOLS ET310KIT AC Circuit Breaker Finder Kit | Best Rated Fluke T5-600 Electrical Voltage | Best Value Fluke -101 Digital Multimeter | |
|---|---|---|---|---|
| Price | $159.99 | $69.98 | $159.36 | $68.55 |
| Rating | 4.8/5 | 4.7/5 | 4.8/5 | 4.7/5 |
| Reviews | 277 | 11,200 | 5,345 | 4,324 |
| Mubboo Score | C+ | B+ | B | B |
What People Say
Synthesized from 40 reviews · 100% verified purchases.
Check included test leads and consider upgrading them for budget meters; for circuit breaker finders, allow time to learn the scanning process and always do a second pass over the panel.
- Good value for money
- Easy to use
- Accurate / reliable readings
- Useful features like backlight or audible alert
- Compact and portable design
- Quality control issues with test leads or defective units
- Requires patience or learning curve for accurate results
Related Video Reviews
- 📹 The Ultimate Voltage Tester Battle: My Surprising Favorite! — Everyday Home Repairs
- 📹 Best Voltage Testers Under $50 (2026) — Top 5 Non-Contact Pens Reviewed! — TECHATOP
About KLEIN TOOLS
- 66 products in our database
- Average rating: 4.7/5 across all products
- Price range: $9.97 – $699.98
- Categories: carpentry-squares, Coolers, Flashlights, Hand Tool Sets, Headlamps, Knee Braces
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Bottom Line
KLEIN TOOLS RT390 Circuit Analyzer earns Mubboo Score C+. Priced at $160 — a premium option, above the category average of $55. Rated 4.8/5 from 277+ reviews. Strong buy if: buyers who prioritize quality over price in testers, those who want a top-rated option. Skip if: you're on a tight budget — KLEIN TOOLS ET310KIT AC Circuit Breaker Finder Kit (Score B+, $70) may fit better.
Frequently Asked Questions
Is the KLEIN TOOLS RT390 Circuit Analyzer worth buying in 2026?
It earns a Mubboo Score of C+, with a 4.8/5 rating from 277 reviews — better than 98% of testers we track.
How much does the KLEIN TOOLS RT390 Circuit Analyzer cost?
It is currently $159.99 — premium-tier pricing for testers.
How does the RT390 Circuit Analyzer compare to other testers?
The category's most-reviewed alternative is the KLEIN TOOLS ET310KIT AC Circuit Breaker Finder Kit (4.7/5, 11,200 reviews, $69.98). The RT390 Circuit Analyzer carries a Mubboo Score of C+ vs B+.
Sources & References
Products available through US retailers. Prices in USD. Sales tax varies by state and is not included.
Mubboo may earn a commission on purchases made through affiliate links. This does not affect our Mubboo Score, product rankings, or editorial judgments. Prices are accurate as of the last sync (2026-06-16) and may change.