Hakko FX-901/P Cordless Battery Soldering Iron vs Uni-T UT139C True-RMS Multimeter
Head-to-head spec comparison to help you pick the right bench tool for your needs.
Hakko
$33.12
Uni-T
$49
Comparing brands?
Read the full Hakko vs Weller vs JBC: The Definitive Soldering Station Brand Comparison →
Brand philosophies, tip ecosystems, 5-year TCO math, and what we'd actually buy with our own money.
Read the brand-comparison guide →Spec-by-Spec Comparison
| Spec | Hakko FX-901/P Cordless Battery Soldering Iron | Uni-T UT139C True-RMS Multimeter |
|---|---|---|
| Station Type | Cordless Soldering Iron | Digital Multimeter |
| Wattage | 6 W | 0 W |
| Temp Range | N/A °C | N/A °C |
| Temp Stability | 0 ±°C | 1 ±°C |
| Tip System | Fixed Battery Tip | Standard Banana Leads |
| Digital Display | No | Yes |
| Temp Lock | No | No |
| Sleep Mode | No | Yes |
| Hot-Air Channel | No | No |
| Channels | 1 | 1 |
| Price | $33.12 | $49 |
| Rating | 3.9/10 | 4.5/10 |
| Buy on Amazon | Buy on Amazon |
Pros & Cons
Hakko FX-901/P Cordless Battery Soldering Iron
Pros
- Genuinely cordless — battery-powered, no bench outlet or station box required
- Useful as a field or automotive second iron when a mains station isn't practical
- Hakko's reliability reputation carries over from the FX-888D line
- Inexpensive enough to keep as a dedicated travel iron alongside a bench station
Cons
- 6W output only handles light-gauge wire and small joints — not a PCB rework tool
- No digital display, temperature lock, or adjustable set-point — a simple on/off battery iron
- Heat-up time and battery life are both noticeably worse than a mains station
- This is a second iron, not a primary bench tool — pair it with a real station like the FX-888D
Uni-T UT139C True-RMS Multimeter
Pros
- True-RMS measurement — essential for AC signals beyond simple sine waves
- Auto-ranging saves constant dial adjustment during debugging sessions
- NCV (non-contact voltage) tester built in
- CAT III 600V safety rating — appropriate for bench and household circuits
- Backlit display readable in dimly lit workbenches
- Remarkably accurate for the price: <1% DC voltage deviation in testing
Cons
- Capacitance measurement is slow compared to dedicated component testers
- Lead quality is mediocre — upgrade to silicone-insulated leads for regular use
- No data logging or USB output
- Case feels plasticky — survivable but not drop-proof
Our Verdicts
Hakko FX-901/P Cordless Battery Soldering Iron
Not a bench station and shouldn't be judged as one — the FX-901/P is a cheap, genuinely useful cordless second iron for field repairs and automotive work where an outlet isn't an option. Buy it to complement a real station, not to replace one.
Uni-T UT139C True-RMS Multimeter
The UT139C punches well above its $50 price. True-RMS, auto-ranging, and CAT III rating make it a legitimate bench multimeter. For hobbyists and repair techs who need accurate readings without Fluke prices, this is the recommendation.
Frequently Asked Questions
Which is better, the Hakko FX-901/P Cordless Battery Soldering Iron or the Uni-T UT139C True-RMS Multimeter?
It depends on your use case. Hakko FX-901/P Cordless Battery Soldering Iron (Hakko, $33.12): Not a bench station and shouldn't be judged as one — the FX-901/P is a cheap, genuinely useful cordless second iron for field repairs and automotive work where an outlet isn't an option. Buy it to complement a real station, not to replace one. Uni-T UT139C True-RMS Multimeter (Uni-T, $49): The UT139C punches well above its $50 price. True-RMS, auto-ranging, and CAT III rating make it a legitimate bench multimeter. For hobbyists and repair techs who need accurate readings without Fluke prices, this is the recommendation.
How much does the Hakko FX-901/P Cordless Battery Soldering Iron cost vs the Uni-T UT139C True-RMS Multimeter?
As of 2026, the Hakko FX-901/P Cordless Battery Soldering Iron is $33.12 and the Uni-T UT139C True-RMS Multimeter is $49 on Amazon — a $15.880000000000003 difference. Amazon list prices fluctuate; check the linked product pages for current pricing.
Is the Hakko FX-901/P Cordless Battery Soldering Iron good for beginners?
Hakko FX-901/P Cordless Battery Soldering Iron is suited for: beginner, vintage. Uni-T UT139C True-RMS Multimeter is suited for: beginner, hobbyist, repair. If you're picking your first bench tool, choose the one whose use-case list includes "beginner" — and prioritize ease of setup over advanced features.
Which has the better support ecosystem, Hakko or Uni-T?
Hakko FX-901/P Cordless Battery Soldering Iron: uses the Fixed Battery Tip tip ecosystem, so replacement tips and specialty shapes matter. Uni-T UT139C True-RMS Multimeter: uses the Standard Banana Leads tip ecosystem, so replacement tips and specialty shapes matter.