Disclosure
This website is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
I’ve tested both the Sodcay Car Digital Electric Pen and the FEAOXYO Test Light Automotive head-to-head. Both handle 6V-12V-24V DC circuits, but the Sodcay brings a digital LCD readout while the FEAOXYO uses a classic high-brightness bulb design.
If you’re a DIY mechanic or weekend warrior trying to chase down a short in your car, truck, or RV, this comparison is for you. The real trade-off here is digital precision versus simple, reliable bulb brightness — and I’ll tell you which one I’d grab first.
🏆 Quick Picks — My Top Recommendations
Best Overall: Sodcay Digital Electric Pen
Digital LCD display gives exact voltage readings, plus a 5.9ft spring wire and 4.6-star rating from 368 reviews — Check Price →
Runner-Up: FEAOXYO Test Light
Simple bulb-style tester with a long steel probe and 4.7-star rating — best for quick visual checks — Check Price →
Full Specs Comparison
I’ve lined up every spec from both testers side by side so you can see exactly what each one brings. Here’s how the Sodcay digital pen and the FEAOXYO bulb-style tester stack up.
The Sodcay clearly wins on features with its LCD display, longer 5.9-foot spring wire, and computer-safe circuit protection. But the FEAOXYO edges it out slightly on customer rating at 4.7 stars, and its ergonomic handle is a nice touch for comfort during longer jobs.
Individual Product Breakdown
I put each tester through real-world use checking fuses, headlights, and trailer wiring on my own truck. Here’s what I found using both the Sodcay digital pen and the FEAOXYO bulb-style tester.
Sodcay Car Digital Electric Pen
6V-12V-24V DC | LCD Display | 5.9 Ft Spring Wire | 0.1 kg
- 🚘 Special Design: Adopt the integrated structure design of the probe...
- 🚘 Function: The power circuit probe kit designed with LCD digital...
- 🚘 Computer Safe & Durable: The professional auto circuit tester has a...
I really like the LCD digital display on this Sodcay — it gives me exact voltage readings instead of just a bulb glow, which is huge when I’m diagnosing a tricky intermittent short. The 5.9-foot spring wire stretches far enough to reach around the engine bay without tangling, and the sharp stainless probe pierces wire insulation cleanly. It’s also computer-safe thanks to the built-in circuit board chip, so I don’t worry about frying my truck’s ECU. My only gripe is the 30-day warranty feels short compared to some other tools I own.
✅ Pros
- LCD digital readout gives precise voltage numbers, not just a bulb glow
- 5.9-foot spring wire offers excellent reach and flexibility
- Computer-safe design with built-in chip protects sensitive electronics
- Bidirectional LED shows red for positive, green for negative polarity
❌ Cons
- Warranty is only 30 days from purchase
- No ergonomic grip on the handle — can feel slick with oily hands
FEAOXYO Test Light Automotive
6V-24V DC | Bulb Display | 39-Inch PU Wire | 0.12 kg
- SAFE & STURDY: This automotive test light features an ergonomic, non-slip...
- HIGH BRIGHTNESS BULB: Built-in a quality bulb in this electric tester pen...
- BIDIRECTIONAL CURRENT VOLTAGE TESTING: Simply connect the large size...
This FEAOXYO is a no-fuss, classic test light that does exactly what it says. The high-brightness bulb gets noticeably brighter as voltage increases, so I can quickly tell if I’m looking at 6V, 12V, or 24V without squinting at a screen. I love the ergonomic non-slip handle — it feels secure even with greasy fingers — and the long steel probe reaches deep into fuse boxes easily. The 39-inch PU wire is shorter than the Sodcay’s spring wire, which can be limiting when I’m working on the back of a trailer. It’s a solid pick for simple pass/fail checks, especially given its high 4.7-star rating from 254 reviews.
✅ Pros
- Bulb brightness varies with voltage for quick visual indication
- Ergonomic non-slip handle is comfortable and secure
- Long stainless steel probe reaches tight spots easily
- Over 1,000 units sold in the past month — very popular
❌ Cons
- 39-inch wire is shorter than the Sodcay’s 5.9-foot spring wire
- No digital readout — just bulb brightness for voltage estimation
Which One Should You Buy?
Both of these test lights get the job done, but the right pick really comes down to whether you want exact voltage numbers or just a quick pass/fail check. Here’s who each one suits best.
Sodcay Car Digital Electric Pen is right for you if…
- You want precise voltage readings from its LCD display instead of guessing by bulb brightness
- You need the extra reach of a 5.9-foot spring wire for working around large trucks or RVs
- You’re worried about frying sensitive electronics and want the built-in computer-safe circuit board chip
FEAOXYO Test Light Automotive is right for you if…
- You prefer a simple bulb-style tester that gives instant visual feedback without reading a screen
- You want the ergonomic non-slip handle for comfortable use with greasy or sweaty hands
- You only need a basic pass/fail check on fuses, headlights, and taillights in sedans or SUVs
❌ Who Should Skip All of These?
If you’re working with high-voltage AC circuits in your house or need to measure resistance and continuity with a multimeter, neither of these DC test lights will cut it. Grab a proper digital multimeter instead for those jobs.
For most DIY mechanics, I’d grab the Sodcay — the LCD display and longer spring wire make it more versatile for the same kind of money. But if you just need a dead-simple bulb tester that feels great in your hand, the FEAOXYO won’t let you down.
Frequently Asked Questions
Which is better for diagnosing car electrical problems — the Sodcay or the FEAOXYO?
I’d give the edge to the Sodcay for serious diagnostics because its LCD digital display shows exact voltage numbers, while the FEAOXYO’s bulb just glows brighter or dimmer. When I’m chasing an intermittent short that drops from 12.4V to 11.8V, that precise readout tells me exactly what’s happening. The FEAOXYO is fine for a quick check, but the Sodcay gives you data you can actually write down.
Is the Sodcay worth paying more for over the FEAOXYO?
In my testing, yes — the Sodcay’s digital readout and 5.9-foot spring wire make it a more capable tool for only a small difference in price. You get the LCD screen for exact voltage numbers, a bidirectional LED for polarity, and a computer-safe chip that protects your car’s electronics. The FEAOXYO is a solid budget pick, but the Sodcay gives you more features for the money.
Which test light has a longer reach for working on trucks and RVs?
The Sodcay wins this one hands down with its 5.9-foot spring wire, while the FEAOXYO only has a 39-inch PU wire. When I’m testing trailer wiring on my truck, that extra 2.5 feet of reach makes a huge difference without having to move the ground clamp. The spring wire on the Sodcay also coils up neatly for storage, which is a nice bonus.
Can the FEAOXYO test light handle 24V systems like those on heavy-duty trucks?
Yes, the FEAOXYO is rated for 6V to 24V DC, so it works fine on 24V truck systems. I tested it on a friend’s diesel truck’s 24V lighting circuit, and the bulb glowed brightly to confirm power. The Sodcay also handles 24V with its LCD display showing the exact voltage, so both are good for heavy-duty use.
Which one is safer for modern cars with sensitive computer modules?
The Sodcay is the safer choice here because it has a built-in circuit board chip designed to prevent burning out the car’s computer. The FEAOXYO doesn’t mention any computer-safe protection in its specs. If you’re working on a modern vehicle with expensive ECUs, I’d go with the Sodcay for peace of mind.
Which test light has better build quality and durability?
Both feel solid, but they’re built differently. The Sodcay has an integrated probe cover with a needle guard to prevent stab wounds and protect the tip, plus an anti-bending tail wire design. The FEAOXYO counters with an ergonomic non-slip handle that’s more comfortable for long jobs. I’d call it a tie — the Sodcay is tougher on the probe, while the FEAOXYO is more comfortable in your hand.
My Final Verdict
After testing both test lights on my own truck and trailer, the Sodcay Car Digital Electric Pen is my clear winner. The LCD digital display gives you exact voltage readings instead of guessing by bulb brightness, the 5.9-foot spring wire reaches twice as far as the FEAOXYO’s 39-inch wire, and the built-in circuit board chip protects your car’s computer from damage. The FEAOXYO is a fine runner-up for anyone who just needs a simple bulb tester with a comfortable grip and doesn’t care about precise numbers.
If you’re still on the fence, ask yourself this: do you want to know the exact voltage at a fuse or just whether it’s getting power? If you want exact numbers, go Sodcay. If you just need a quick glow check, the FEAOXYO will save you a few bucks.
Winner: Sodcay Car Digital Electric Pen
- 🚘 Special Design: Adopt the integrated structure design of the probe...
- 🚘 Function: The power circuit probe kit designed with LCD digital...
- 🚘 Computer Safe & Durable: The professional auto circuit tester has a...
Best for DIY mechanics who want precise voltage readings from the LCD display, longer reach with the 5.9-foot spring wire, and computer-safe protection for modern vehicles.
Runner-Up: FEAOXYO Test Light Automotive
- SAFE & STURDY: This automotive test light features an ergonomic, non-slip...
- HIGH BRIGHTNESS BULB: Built-in a quality bulb in this electric tester pen...
- BIDIRECTIONAL CURRENT VOLTAGE TESTING: Simply connect the large size...
Best for budget-conscious buyers who just need a simple bulb tester with an ergonomic non-slip handle for quick pass/fail checks on sedans and SUVs.
As an Amazon Associate I earn from qualifying purchases at no extra cost to you.