Fluke ST120+ GFCI Socket Tester
with Audible Beeper
Price as of 2026-06-16. Check Amazon for the current price.
Quick Decision
Is This Right For You?
- •Those who want a top-rated option — in the top 2% of testers by rating
- •WINAMOO Premium LED Bulb Automotive Circuit Tester — 59% cheaper at $9 (Score A)
📊 Based on data analysis of 185 products in this category.
Mubboo Score: B+
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 · last refreshed 2026-06-16.
How It Compares
This Product Fluke ST120+ GFCI Socket Tester | Most Popular AstroAI Digital Multimeter Tester 2000 Counts | Best Rated KLEIN TOOLS RT250 GFCI Outlet Tester | Best Value WINAMOO Premium LED Bulb Automotive Circuit Tester | |
|---|---|---|---|---|
| Price | $21.84 | $14.59 | $24.97 | $8.99 |
| Rating | 4.8/5 | 4.5/5 | 4.8/5 | 4.7/5 |
| Reviews | 1,669 | 54,848 | 11,490 | 3,555 |
| Mubboo Score | B+ | A+ | A- | A |
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 Fluke
- 19 products in our database
- Average rating: 4.7/5 across all products
- Price range: $21.84 – $445.55
- Categories: testers
Other testers
Bottom Line
Fluke ST120+ GFCI Socket Tester earns Mubboo Score B+. Priced at $22 — a mid-range option, below the category average of $55. Rated 4.8/5 from 1,669+ reviews. Strong buy if: those who want a top-rated option.
Frequently Asked Questions
Is the Fluke ST120+ GFCI Socket Tester worth buying in 2026?
It earns a Mubboo Score of B+, with a 4.8/5 rating from 1,669 reviews — better than 98% of testers we track.
How much does the Fluke ST120+ GFCI Socket Tester cost?
It is currently $21.84 — mid-tier pricing for testers.
How does the ST120+ GFCI Socket Tester compare to other testers?
The category's most-reviewed alternative is the AstroAI Digital Multimeter Tester 2000 Counts (4.5/5, 54,848 reviews, $14.59). The ST120+ GFCI Socket Tester carries a Mubboo Score of B+ vs A+.
Sources & References
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.