Professional Highest-Precision R-L-C Meter

Also known as: SMART TWEEZERS

SMD Pre-Calibrated Component Identifier in a Set of Tweezers

Interested Companies to distribute this product in their countries are welcome
to contact: or call USA at (570) 842-2812
This is a great tool and can be used by almost anyone working with SMD's
TO BUY from stock
see Smart Tweezers Distributor in Your Region
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Available technical information:


A Smart Way for Testing SMD Components

Smart Tweezers™ are a handheld LCR meter that provides users with a simpler method of identifying and evaluating Surface Mount Devices and troubleshooting complex electronic systems. The unique design combines a set of precision gold-plated tweezers and a powerful, yet small digital LCR-meter in a lightweight device. Powered by a Li-Ion battery, Smart Tweezers can identify the type of component and measure for Inductance, Resistance and Capacitance.


  • High-precision LCR probes
  • Convenient one-hand operation
  • Automated component identification
  • Automated test range selection
  • Manual C, R, L, Z and ESR modes
  • Adjustable test signal levels
  • Swiss-made precise test probes
  • Diode Polarity/Short testing
  • Secondary D, Q and ESR parameters
  • Eergonomic and portable
  • Built-in Li-Ion rechargeable battery

Testing Surface Mount Components

Electronic manufacturing has begun using Surface Mount Technology, where small components (referred to as Surface Mount Devices or SMDs) are mounted directly to a PCB, opposed to the older through-hole method, where wire leads were threaded through holes on the PCB. SMDs are generally very small and may or may not have wire leads or other distinguishing characteristics, making them more difficult to tell apart from one another. This may lead to lost component values, or confusion between components. Smart Tweezers offer users an easier way to sort and identify these components, as well as perform on-board measurements and debugging. The gold-plated tips are Swiss made by IDEAL-TEK S.A. and provide a reliable contact on even the smallest component, either loose or mounted. Smart Tweezers are also able to test conventional components that may have wire leads that are too short to fit in test terminals.

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Fully Automatic Evaluations

Measurements are done faster using Smart Tweezers™. The automatic identification function eliminates unnecessary trial and error, thus saving time. When in contact with an SMD, Smart Tweezers automatically determine the type of component, determines the proper measurement range and test frequency, and measures for L, C or R with parallel and series mode. The evaluation results are then instantaneously available on the display, as well as the component type, test parameters and more detailed component analysis such as Z and ESR.The bright OLED display instantly shows the values, the component type and test parameters used, as well as a more detailed component analysis, such as Z and ESR values. 

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Very light and Ergonomic

Smart Tweezers are easy to use with just one hand, and without the need to set-up between measurements, users can focus on the task at hand. Sorting, testing and troubleshooting become more efficient and cost effective. The handles on the device are a 4-wire connection and shielded to assure low capacitance and resistance offset while measuring.

Wide Spectrum of Additional Functions

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  • Smart Tweezers LCR meter test various component types, including secondary components for Dissipation Factor (D), Quality Factor (Q) as well as other functions that result in a more detailed component analysis.
  • The built-in Equivalent Series Resistance (ESR) mode helps better understand the inherent resistance, a behavior typically found in capacitors across selected frequencies.
  • A Diode mode allows Smart Tweezers to test diode polarity and indicates if it is short.
  • A Continuity detector sounds a beeper for resistance that reads below the set thresholds. This function also allows users to easily seek out a shorted conductor within a circuit.
  • Manual modes allow the user to test for specific parameters such as L, C, R, Z or ESR. this more also improves component type identification for in-circuit testing.
  • Variable test signal output from 0.25 to 1.0 Vrms allow test precision for different situations, such as in-circuit evaluations and loose leaded ceramic capacitors.
  • Visible and audible tolerance modes for performing component sorting.
  • A Math Null function allows users to store pre-measured offsets and improve measurement accuracy.

ST-5S  Smart Tweezers Specifications


Operating Temperature:

0 °C to +50 °C

Storage Temperature:

-40 °C to +70 °C

Relative Humidity:

0 % to 90 % (0 °C to 35 °C) 
0 % to 70 % (35 °C to 55 °C)

Altitude Operating:

0-2000 meters

Battery Type:

3.7 V LiPO rechargeable 150 mAh

Typical Charge Time:

2.5 Hours

Electromagnetic Compatibility (EMC):

Susceptibility and Emission: CE 89/336, FCC 15 part B


14.0 x 2.5 x 3.0 cm (3.94 x 0.9 x 1.5 in)


53 grams (0.11lb)


1 year

Functional  Specifications

Measured Parameters:

L, C, R, ESR, D, Q

Measuring Frequencies:

100 Hz, 120 Hz, 1 kHz, 10 kHz

Measurement rate:

1 time per second


0.05 Ohms to 9.9 MOhms


0.5 pF to 4,999 µF


0.5 µH to 999 mH

Dissipation Factor:

0.001 to 1000

Accuracy is specified at 18°C to 28°C (64°F to 82°F), with relative humidity to 90%.



0.2% in range 100 R to 10 K, 0.5% in range 1 R to 1 M



0.2% in range 10 nF to 10 µF, 0.5% in range 100 pF to 1 mF



0.2% in range 10 mH to 100 mH, 0.5% in range 100 µH to 1H

Basic Version of the SMT Smart Tweezers  with smaller accuracy, but still very good for SMT components identification and measurements is called LCR-Reader.


LCR-Reader   Made in North America by Inventors of Smart Tweezers


Consumer's choice LCR-meter, the most light-weight, small and affordable member of Smart Tweezers LCR-meter family is finally available for sale.

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                                               LCR-Reader, the Lightest LCR-meter, Released, August 31, 2013

After a few months of final debugging and fine-tuning LCR-Reader, a new, low cost member of Smart Tweezers LCR-meter family is available for distribution.

This new design with a record low weight and size, is a budget model of the popular professional device. It maximizes operation simplicity and ease-of-use complimented with affordable price while still keeping high basic accuracy.

        Tests performed on the first few hundred units demonstrated basic accuracy variations fitting the targeted 1% accuracy specifications. The accuracy issues were overcome by individual calibration of every unit using calibration fixture.

        The manufacturing team is very happy with the new device. Customer satisfaction is their main priority. Therefore they took additional measures to ensure high measurement accuracy of the LCR-Reader before mass production of this model have been started. Basic accuracy of 1% was the target and we eventually have been able to achieve it."

       Compared to previous Smart Tweezers models, LCR-Reader is about two times smaller and lighter. The display is implemented using high contrast LED screen. For ultimate simplicity of the device operation, there is only control button that switches measurement mode by a single push from Automatic, to Capacitance, Inductance, Resistance, and ESR modes.

       Li-Ion rechargeable battery is used to power the device with a micro-USB connector. Test signal amplitude is 0.5 Vrms, and test frequency is selected automatically.

        LCR-Reader measurement example display is shown on a picture to the right. Here AM indicates the measurement mode (Automatic Mode). Like Smart Tweezers, LCR-Reader in addition to the main impedance component L, C or R it also shows the parasitic impedance component. In the example 10 kHz is the test frequency, Rs indicates parasitic series resistance  of the inductor, L shows that the component type is an inductor, 104.8 uH indicates its value, and in the right bottom corner of the screen the battery charge level is shown.


This is a low cost device and the following Smart Tweezers features are not available in this model: 
Component Sorting 
Automatic offset adjustment 
Open Circuit/ Continuity/ Diode/ test


LCR-Reader Feature Summary: 

Automatic LCR and ESR measurement 
Basic accuracy of 1% 
Best range automatic selection 
Li-Ion battery with a micro-USB connector 
About 1 Oz weight

Note: USB Charger is not included with this unit.   


Please click to download  LCR-Reader Manual

* indication of the parameter not implemented in some versions