Full technical review FNIRSI LCR-ST-2 2-in-1

Product Introduction

The FNIRSI LCR-ST-2 2-in-1 is a cutting-edge, multifunctional, and portable tweezer-type LCR meter designed to address the critical need for precise component testing in modern electronics. This device stands out in the market by offering accurate measurements of resistance, capacitance, inductance, and diodes, alongside voltage measurement up to 30V, all within a compact, ergonomic form factor. Its unique tweezer-style design makes it exceptionally well-suited for fine operations in confined spaces, such as on densely populated PCBs or with surface-mount devices (SMD), where traditional probes might struggle. Engineered for high accuracy and stability, the LCR-ST-2 is an indispensable tool for electronics enthusiasts, repair technicians, and field engineers who require efficient and reliable component characterization. Check out our other technical reviews for more hardware testing.

Hardware specifications

Core Specifications: FNIRSI LCR-ST-2 2-in-1

Model: LCR-ST2
Display: 1.47-inch HD color screen
Battery: 300mAh lithium battery (Included)
Battery Life: Approximately 3 hours
Charging Port: Type-C
Dimensions: 31 x 170.7 x 20.3 mm
Net Weight: Approximately 60.8g
Operating Temperature: 0℃ – 50℃ (≤75%RH)
Storage Temperature: –20℃ – 60℃ (≤75%RH)
Auto power-off: Never / 5min / 15min / 30min
Language: English / Chinese
Calibration: Open / Short / Multiple resistor calibration
Adjustable screen brightness & sound: Yes
Operating Mode: Auto Range
Auto recognition: R/C/L
Measuring Capacitance Range: 1pF – 22mF
Measuring Inductance Range: 1µH – 10H
Measuring Resistance Range: 10mΩ – 10MΩ
Diode forward voltage detection: ≤0.7V
Voltage range: ±30V (DC Voltage 30, AC Voltage 30)
Frequency sweep: 100Hz – 100kHz
Test Frequencies: 100 Hz, 120 Hz, 1 kHz, 10 kHz, 100 kHz
Certification: CE
Origin: Mainland China
High-concerned chemical: None
DIY Supplies: Electrical

Available Versions

Available Versions & Selection Guide

The FNIRSI LCR-ST-2 2-in-1 is available in two distinct sets to cater to varying user needs:
— LCR-ST2 Set1: This standard package includes the LCR-ST2 Host with a Tweezer-Style Clip, a Storage Bag, a Curved tip, a Shorting Plate, and a Data Cable.
— LCR-ST2 Set2: This enhanced package includes all items from Set1, with the addition of a professional Kelvin Test Clip, offering improved accuracy for critical measurements.

Package Contents

What’s in the Box?

LCR-ST2 Set 1:
1. LCR-ST2 Host + Tweezer-Style Clip
2. Storage Bag
3. Curved tip
4. Shorting Plate
5. Data Cable

LCR-ST2 Set 2:
1. LCR-ST2 Host + Tweezer-Style Clip
2. Storage Bag
3. Curved tip
4. Shorting Plate
5. Kelvin Test Clip
6. Data Cable

Features and benefits

Why I love FNIRSI LCR-ST-2 2-in-1

Multifunctional Measurement Capabilities The FNIRSI LCR-ST-2 2-in-1 is not just an LCR meter; it precisely measures resistance from 10mΩ to 10MΩ, capacitance from 1pF to 22mF, and inductance from 1µH to 10H. Additionally, it supports diode forward voltage detection up to ≤0.7V and voltage measurement up to ±30V (both DC and AC). This comprehensive range of functions makes it an incredibly versatile tool for diagnosing and characterizing a wide array of electronic components, eliminating the need for multiple specialized instruments.
Advanced Frequency Sweep and Multi-Frequency Testing The device offers a frequency sweep function across a full range from 100 Hz to 100 kHz, allowing users to rapidly scan component parameters and obtain multi-frequency data with a single press. It supports five distinct test frequencies: 100 Hz, 120 Hz, 1 kHz, 10 kHz, and 100 kHz. This capability is crucial for understanding how components behave under different operating conditions, providing a more accurate characterization than single-frequency testers, especially for frequency-dependent components like inductors and capacitors.
High Accuracy Across Diverse Ranges The FNIRSI LCR-ST2 2-in-1 boasts impressive accuracy specifications, which vary depending on the component type, range, and test frequency. For capacitance, it achieves 0.5% ±3 for 1nF-1µF at 1KHz, and 2% ±3 for 1µF-1mF at 100Hz/120Hz/1KHz/10KHz. Inductance measurements show 0.5% ±3 for 10µH-1mH at 1KHz, and 2% ±3 for 1mH-1H at 100Hz/120Hz/1KHz/10KHz. Resistance measurements are equally precise, with 0.5% ±3 for 1kΩ-1MΩ at 1KHz, and 1% ±3 for 1Ω-1kΩ at 100Hz/120Hz/10KHz. This high level of precision ensures reliable data for critical applications, from component selection to fault diagnosis.
Ergonomic Tweezer-Style Design with Kelvin Clips The unique tweezer-style form factor, combined with the option of professional Kelvin test clips (included in Set 2), is specifically engineered for fine operations on surface-mount devices (SMD) and in densely packed circuit boards. This design allows for quick, precise, and stable contact with small components, significantly improving efficiency and reducing the risk of errors compared to traditional probe methods. The Kelvin clips minimize measurement errors caused by lead resistance, ensuring more accurate readings.
Intuitive User Experience and Portability Featuring a vibrant 1.47-inch HD color display and a mini joystick for easy control and mode selection, the FNIRSI LCR-ST-2 2-in-1 provides a detailed and user-friendly interface. Its lightweight design, weighing approximately 60.8g, and compact dimensions (31×170.7×20.3mm) make it highly portable for field engineers and technicians. The built-in 300mAh lithium battery, rechargeable via a convenient Type-C port, offers approximately 3 hours of operating time, further enhancing its utility for on-the-go diagnostics. Additional features like auto power-off (Never/5/15/30min), adjustable screen brightness, and sound contribute to a customizable and efficient user experience.
Intelligent Sorting and Dual-Mode Display The intelligent sorting function automatically classifies and filters components, streamlining batch testing and significantly boosting efficiency in production or repair environments. Furthermore, the dual-mode simultaneous display allows users to view two different measurement modes on the same screen, facilitating direct comparison and making result analysis more intuitive and efficient. This feature is particularly useful for quickly assessing component characteristics and identifying discrepancies.

Pros and Cons

Strengths & Weaknesses:

What I Like

Comprehensive measurement capabilities (R, C, L, Diode, Voltage up to ±30V)
Tweezer-style design ideal for SMD and confined spaces
High accuracy across multiple frequency ranges (100Hz to 100kHz)
Frequency sweep function for detailed component characterization
Intelligent sorting function for efficient batch testing
Dual-mode simultaneous display for intuitive result comparison
Portable and lightweight (approx. 60.8g) with compact dimensions
Built-in 300mAh rechargeable Type-C battery with ~3 hours operating time
1.47-inch HD color display and mini joystick for easy navigation
Includes Kelvin test clips in Set 2 for enhanced accuracy
Adjustable auto power-off, screen brightness, and sound
Firmware upgradable

Points to Consider

No explicit signal generator function
No LED continuity test
Rocking wheel/joystick can be sensitive and requires a «flick» motion for smooth operation
Calibration mode may not always be active, sometimes requiring a restart
Kelvin probe not easily available as a separate accessory for Set 1 purchasers
Some users reported issues with customer service regarding accessory availability
One user reported not receiving the item or a refund, indicating potential delivery/seller issues
Tweezers sponges might converge unevenly in some units

Price and Availability

Where to Buy & Customer Reviews

Check Price on AliExpress (Best Value)

AliExpress

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Store info

STORE

⭐ 98.6% Positive Feedback | 123.0K Followers

Name:	FNIRSI Official Store
Store no.:	2939001
Location:	China
Open since:	Feb 26, 2017

Detailed seller ratings

Item as Described	4.9 Above Average
Communication	4.9 Above Average
Shipping Speed	4.9 Above Average

OTHER GOODS

User reviews

User Reviews & Feedback Analysis ⭐ 4.9 (114) | Sold (500+)

Reviews FNIRSI LCR-ST-2 2-in-1

uthentic Feedback Analysis:
⭐ 5.0/5 | 岩***兎: It’s very good, it can do most basic things. Resistors, capacitors, diodes, inductors, DCV (up to 40V), etc. It gives roughly the same values as customM-09FBM, ANENG683, HIOKI 3200, HP 3465B. I think it’s one of the best testers you can buy for this price. It’s a good product that I can recommend to others.
⭐ 5.0/5 | A***n: Finally a very professionally designed LCR tester WITH ESR C value measurement and Simultaneous displaying of Serial and Parallel values in several selectable frequencies. With mini joystick for easy controlling and mode selecting with colorful display screen for very detailed presentation. FNIRSI always excellent in design and affordable products included with professional Kelvin clips and decent tweezer pouch. With internal USB-C chargeable 300mAh battery.
⭐ 5.0/5 | P***s: 6 days from order to delivery, very excellent service. Arrived undamaged. Great little gadget, so handy for checking the values of components. Feels well made, Kelvin clips easy to swap in and out. No serious accuracy testing done but first tests were consistent with component values. Only one comment: the rocking wheel on the side, used to scroll through options needs to be operated speedily, almost with a flick rather than a measured movement. I was holding this wheel too long and thought initially the meter was broken. Similarly when you push the wheel to select. Other than that very intuitive to use. Highly recommended.
⭐ 5.0/5 | AliExpress Shopper: A good interesting tweezer, I don’t regret taking it, updated the firmware to v1.5.1, noticed that the calibration mode is not always active, a reboot helps, I don’t consider the absence of a generator a disadvantage, but an LED continuity test would not hurt, the sorting function did not attract me, overall I was pleased, I recommend buying it and the seller.
⭐ 5.0/5 | T***l: I very rarely write a review but this time I must. The build quality is excellent. I really like the USB interface for the probes. This is a really clever solution because if anyone had the need for their own style of probes for whatever reason, this is really simple and elegant way how to implement them. Big thumbs up for flexibility. Of course all functions work as they should and the case is also very nice with all its accessories. Great package for great price FNIRSI, I am a happy customer.
⭐ 5.0/5 | A***v: Arrived on time. Very neatly packaged. With perfect quality. Works accurately, also has reference elements. I am very satisfied. I recommend it!
⭐ 5.0/5 | D***r: Excellent. Innovative product with high build quality.
⭐ 5.0/5 | L***z: Arrived in good order and quickly, Excellent LCR tester.
⭐ 5.0/5 | AliExpress Shopper: Very well built, I’m already using it for my repairs, fast reading, excellent.
⭐ 4.0/5 | a***r: This is a difficult one to rate although I think it’s mostly my own fault. I really wanted to also get the Kelvin probe and I should have ordered the Pro version when ordering. I like the meter it works very well and is quite accurate. Just a warning to purchasers to be sure to check your order carefully. The problem now is I cannot find the Kelvin probe as an accessory and may have to order another unit to get the probe. I have reached out to Fnirsi and hope to hear back from them. I’m finding the LCR bridge very useful however I would like to order the Kelvin probe. I’ve sent at least two emails to customer service with no reply. I’m a little bit disappointed. I was hoping customer service would be able to help me but only crickets…
⭐ 5.0/5 | AliExpress Shopper: The order was received on 02.02.26, in just 10 days from the order date, which is simply a lightning-fast result! The seller is verified, reliable! The product is of high quality, reliably packaged as in all previous orders. Immediately updated to firmware 1.5.1 (it was 1.4.0), very convenient and fast. Many thanks to everyone (seller and delivery services) and have a good day. Happy New Year, all the best and good luck to you!!!
⭐ 5.0/5 | AliExpress Shopper: Fast shipping, well packaged, excellent tweezers, I recommend the seller….
⭐ 5.0/5 | R***s: The measuring tweezers are well packaged, arrived ahead of schedule and intact. The device is charged and ready to work immediately. The menu and controls take some getting used to, they are peculiar. The build quality is good.
⭐ 5.0/5 | V***h: Everything is great, as always Fnirsi is on top. It works.
⭐ 5.0/5 | AliExpress Shopper: Looks great, very well packed and secured, very good quality, I will check how it works tomorrow. The shipment arrived quickly and at a good price, I recommend the store, trustworthy, I will definitely buy from them again. Rating 5/5
⭐ 5.0/5 | M***V: Very polite seller! The product corresponds to the description. I recommend the seller as correct and responsive!
⭐ 5.0/5 | Z***r: Good product! Fast delivery, everything’s fine! Thank you! Product faithful to the description. Very fast delivery even before the scheduled date!! I warmly recommend this seller!
⭐ 5.0/5 | j***r: The truth is that everything arrived perfectly packed and without bumps like other times. Thank you AliExpress, I love shopping on AliExpress.
⭐ 5.0/5 | V***H: Always good quality of their products, recommend the seller.
⭐ 5.0/5 | AliExpress Shopper: The package is very well packed. The device is very good👍
⭐ 5.0/5 | AliExpress Shopper: The quality is quite good, the tests are conclusive.
⭐ 5.0/5 | A***s: Everything is great, as always the service is excellent. It works
⭐ 5.0/5 | AliExpress Shopper: Great tool. Exactly as described. Very high quality. Recommend
⭐ 5.0/5 | AliExpress Shopper: Fast delivery, affordable price, good quality, thank you.
⭐ 5.0/5 | W***n: Good seller. Helped me really well.
⭐ 5.0/5 | 9***r: Just as described and received the item promptly.
⭐ 5.0/5 | E***s: Very good equipment! Just as shown!!
⭐ 5.0/5 | h***a: Excellent equipment, good quality, versatile.
⭐ 5.0/5 | AliExpress Shopper: Satisfied with the purchase. Very fast delivery to Ukraine. Perfect packaging. Excellent calibration.
⭐ 5.0/5 | AliExpress Shopper: Works very well 🤠
⭐ 5.0/5 | J***K: Everything Ok
⭐ 5.0/5 | M***s: All ok. Thanks.
⭐ 5.0/5 | AliExpress Shopper: Everything is in the best possible way, thanks to the seller, I recommend buying here.
⭐ 5.0/5 | AliExpress Shopper: Thank you, everything is cool.
⭐ 5.0/5 | S***i: Product consistent with the description, well made. Quality worth recommending.
⭐ 5.0/5 | V***v: Perfect 🙂
⭐ 5.0/5 | P***r: Super
⭐ 5.0/5 | AliExpress Shopper: Perfect
⭐ 5.0/5 | AliExpress Shopper: Thank you, everything is fine.
⭐ 5.0/5 | AliExpress Shopper: Incredible and very useful.
⭐ 5.0/5 | AliExpress Shopper: Excellent product.
⭐ 5.0/5 | AliExpress Shopper: Best of the best 👌
⭐ 5.0/5 | C***n: Received in good time, very well packed. Works well.
⭐ 5.0/5 | G***V: Arrived very quickly, packaging is super.
⭐ 5.0/5 | A***s: The product corresponds to the description.
⭐ 5.0/5 | AliExpress Shopper: Appears to be of good quality. Decent price.
⭐ 5.0/5 | T***k: As expected.
⭐ 4.0/5 | S***i: Not yet tried but the first impression is positive.
⭐ 4.0/5 | J***k: Looks good. Haven’t tested yet.
⭐ 5.0/5 | m***c: Ok thanks
⭐ 5.0/5 | AliExpress Shopper: Everything ok. Thanks.
⭐ 4.0/5 | AliExpress Shopper: The tweezers sponges converge unevenly otherwise it’s ok.
⭐ 1.0/5 | AliExpress Shopper: Did not receive item, while it being marked as delivered. Never received item or got refund. Seller and AliExpress scammed me. I was trying for 3 weeks to get my item or money but nobody helped me.

Pinout and Interface Map

PRODUCT PARAMETER FNIRSI LCR-ST-2 2-in-1

FNIRSI LCR-ST-2 2-in-1

Comparison table

Technical Specifications & Comparison FNIRSI LCR-ST-2 2-in-1

Parameter	Range	100Hz/120Hz Accuracy	1KHz Accuracy	10KHz Accuracy	100KHz Accuracy
Capacitance	1mF-22mF	5% ±3	5% ±3	/	/
	1µF-1mF	2% ±3	2% ±3	2% ±3	5% ±3
	1nF—1µF	2% ±3	0.5% ±3	0.5% ±3	5% ±3
	1pF-1nF	/	2% ±3	2% ±3	5% ±3
Inductance	1H-10H	5% ±3	5% ±3	/	/
	1mH-1H	2% ±3	2% ±3	2% ±3	5% ±3
	10µH-1mH	2% ±3	0.5% ±3	0.5% ±3	5% ±3
	1µH-10µH	/	2% ±3	2% ±3	5% ±3
Resistance	1MΩ-10MΩ	5% ±3	5% ±3	/	/
	1kΩ-1MΩ	1% ±3	0.5% ±3	1% ±3	/
	1Ω-1kΩ	1% ±3	0.5% ±3	1% ±3	5% ±3
	10mΩ-1Ω	2% ±3	2% ±3	2% ±3	5% ±3
Diode & Voltage	On-state voltage ≤0.7V	/
Diode & Voltage	Voltage range ±30V	/

Final summary

Final Verdict: FNIRSI LCR-ST-2 2-in-1

The FNIRSI LCR-ST2 2-in-1 stands out as a highly capable and exceptionally portable LCR meter, offering a compelling blend of precision, versatility, and user-friendly design. Its ability to accurately measure a wide range of components (R, C, L, Diode, Voltage) across multiple frequencies, coupled with the innovative tweezer-style form factor, makes it an ideal choice for both hobbyists and professional engineers working with SMD components or in tight spaces. While minor quirks like the sensitive joystick and occasional calibration reboots exist, these are largely overshadowed by its robust feature set, including frequency sweep, intelligent sorting, and dual-mode display. For anyone seeking a reliable, efficient, and compact tool for electronic component characterization and repair, the LCR-ST2 represents excellent value for money, with its high accuracy and portability being its paramount advantages. It’s a solid investment for enhancing diagnostic capabilities in any electronics toolkit. For more in-depth analyses, visit andibond.com.

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