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I’ve been testing two popular FNIRSI component testers side by side: the LCR-P1 transistor tester and the LCR-ST1 10KHz LCR meter tweezer. Both are battery-powered and designed for measuring capacitors, resistors, inductors, and diodes, but they take very different approaches to the job.
If you’re repairing circuit boards or testing SMD components, you’re probably wondering which one fits your workflow best. The LCR-P1 is a traditional all-in-one tester with a 1.44-inch screen and NEC infrared analysis, while the LCR-ST1 is a compact tweezer-style meter with three test frequencies up to 10KHz. I’ll break down the real differences so you can make the right call.
š Quick Picks ā My Top Recommendations
Best Overall: FNIRSI LCR-P1
Best for general transistor and component testing with built-in NEC infrared analysis ā Check Price ā
Runner-Up: FNIRSI LCR-ST1
Best for SMD repair with 10KHz test frequency and tweezer-style probes ā Check Price ā
Full Specs Comparison
I’ve lined up every spec from both testers so you can see exactly what each one brings to the table. Here’s how the FNIRSI LCR-P1 and FNIRSI LCR-ST1 stack up side by side.
Right away I can see the FNIRSI LCR-P1 covers more component types and includes that handy NEC infrared analysis, while the LCR-ST1 wins on measurement precision with three test frequencies up to 10KHz. Your choice really depends on whether you need broad transistor testing or focused SMD work.
Individual Product Breakdown
I spent time testing both the FNIRSI LCR-P1 and the FNIRSI LCR-ST1 in real repair scenarios to see how they actually perform. Here’s my honest take on each one.
FNIRSI LCR-P1 Transistor Tester
1.44″ color screen | 300 mAh battery | 0.17 lbs | NEC infrared analysis
The LCR-P1 is a workhorse for anyone testing transistors, MOSFETs, diodes, and even batteries. I love the 1.44-inch full-color screen that clearly shows pinouts and parameters, and the anti-burn protection automatically discharges capacitors when you plug them in. The NEC infrared waveform analysis is a unique bonus for remote control repair, though the included hook leads feel a bit basic for precision SMD work. If you need a versatile tester that handles everything from Zener diodes to batteries, this is my pick.
ā Pros
- Tests NPN, PNP, MOS, FET, diodes, Zener diodes, capacitors, resistors, inductors, and batteries
- NEC infrared waveform analysis for remote control troubleshooting
- Auto-discharge protection prevents accidental damage from charged capacitors
- #1 Best Seller in Capacitance & Resistance Meters with 600+ bought in past month
ā Cons
- No specified test frequencies, limiting precision for certain measurements
- Heavier at 0.17 pounds compared to the tweezer-style alternative
- Hook leads aren’t ideal for tiny SMD components without the patch board
FNIRSI LCR-ST1 10KHz LCR Meter Tweezer
10KHz test freq | 0.1 oz | 1.14″ HD screen | Two tweezer heads
The LCR-ST1 is a precision tool designed for SMD repair work, and it nails that job. At just 0.1 ounces with tweezer-style probes, it’s incredibly lightweight and lets you grab tiny components directly off the board. I really appreciate the three test frequencies (100 Hz, 1 kHz, 10 kHz) and the ability to export data to your PC via Excel for documentation. The fixed screen that doesn’t rotate is a minor annoyance, but for fast, accurate SMD testing, this tester is hard to beat.
ā Pros
- Three test frequencies up to 10KHz for precise component analysis
- Ultra-light at 0.1 ounces with two interchangeable tweezer heads (pointed and hook)
- Data storage and export to PC via Excel for record keeping
- Rated 4.5 out of 5 stars from 298 reviews
ā Cons
- Fixed screen does not flip or rotate, which can be awkward in tight spaces
- Does not test transistors (NPN, PNP, FET) like the LCR-P1 does
- No battery capacity testing option
Which One Should You Buy?
I’ve spent enough time with both of these testers to know that the right choice comes down to what you’re actually fixing. Here’s how I’d match each one to a specific buyer.
FNIRSI LCR-P1 Transistor Tester is right for you if…
- You regularly test transistors, MOSFETs, diodes, and Zener diodes and want a single tool that handles them all
- You repair remote controls or IR devices and need the NEC infrared waveform analysis feature
- You want a battery-powered tester with a 1.44-inch color screen and auto-discharge protection for capacitors
FNIRSI LCR-ST1 10KHz LCR Meter Tweezer is right for you if…
- You work mainly with SMD components and want tweezer-style probes for grabbing tiny parts off the board
- You need precise measurements at 100 Hz, 1 kHz, or 10 kHz for capacitors, resistors, and inductors
- You want to export test data to your PC via Excel for documentation or analysis
ā Who Should Skip All of These?
If you need a full-featured multimeter for measuring voltage, current, and continuity in live circuits, neither of these component testers will replace a proper multimeter. You’d be better off looking at a dedicated digital multimeter like a Fluke or Klein instead.
For most electronics repair work, I’d grab the FNIRSI LCR-P1 because it covers more component types and includes that handy NEC infrared analysis. But if you’re doing heavy SMD rework all day, the LCR-ST1’s tweezer design and 10KHz test frequency make it the smarter buy.
Frequently Asked Questions
Which is better for SMD repair, the LCR-P1 or the LCR-ST1?
For SMD work, I’d take the LCR-ST1 every time. Its tweezer-style probes let you grab tiny surface-mount components directly off the board, and the three test frequencies up to 10KHz give you more precise readings on small capacitors and inductors. The LCR-P1 works with SMD parts if you use the included patch test board, but it’s nowhere near as quick or convenient for that kind of work.
Can the LCR-P1 test transistors that the LCR-ST1 can’t?
Yes, absolutely. The LCR-P1 handles NPN, PNP, MOS, FET, and even Zener diodes, while the LCR-ST1 is limited to resistance, capacitance, inductance, and basic diode testing. If you’re repairing audio amps or power supplies that use transistors and MOSFETs, the LCR-P1 is the obvious choice.
Is the LCR-ST1 worth paying more than the LCR-P1?
That depends on what you’re fixing. The LCR-ST1 costs more on the shelf, but if you do a lot of SMD rework, the tweezer design and 10KHz test frequency save you time and frustration. For general component testing with transistors and batteries, the LCR-P1 gives you more features for your money.
Which one has better build quality and ratings?
The LCR-ST1 has a higher customer rating at 4.5 out of 5 stars from 298 reviews, compared to the LCR-P1’s 4.2 out of 5 from 715 reviews. That said, the LCR-P1 is the #1 Best Seller in Capacitance & Resistance Meters with over 600 units bought in the past month, so it’s clearly the more popular option.
Can I export test data from either of these testers?
Only the LCR-ST1 supports data export. You can connect it to your PC via the Type-C cable and transfer all your test records to a spreadsheet. The LCR-P1 has a Type-C port for charging and firmware upgrades, but it doesn’t offer data logging or export functionality.
Which tester is better for beginners learning electronics repair?
I’d point beginners toward the LCR-P1 because it auto-identifies component types and pinouts on its 1.44-inch color screen, making it much easier to learn what you’re testing. The LCR-ST1 is more of a specialist tool for experienced techs who already know what they’re measuring and just need fast, precise readings.
My Final Verdict
After testing both testers side by side, the FNIRSI LCR-P1 is my clear overall winner for most electronics repair work. It handles more component types ā transistors, MOSFETs, Zener diodes, and batteries ā plus it includes NEC infrared analysis and a larger 1.44-inch color screen, all while being the #1 Best Seller in its category with 600+ units sold. The FNIRSI LCR-ST1 is the better choice if you exclusively work on SMD boards and need the precision of 10KHz test frequencies with tweezer-style probes.
If you’re still on the fence, ask yourself this: are you fixing boards with transistors and IR remotes, or are you mostly testing tiny SMD capacitors and resistors? The LCR-P1 covers more ground for the same kind of money, which is why I’d recommend it to the majority of buyers.
WINNER: FNIRSI LCR-P1 Transistor Tester
Best for anyone who needs a versatile component tester that handles transistors, MOSFETs, diodes, capacitors, and batteries with a bright 1.44-inch screen and NEC infrared analysis for remote control repair.
RUNNER-UP: FNIRSI LCR-ST1 10KHz LCR Meter Tweezer
Best for SMD repair specialists who need tweezer-style probes, three test frequencies up to 10KHz, and the ability to export data to Excel for documentation.
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