FNIRSI LCR-ST1 Smart Tweezer LCR ESR SMD Tester The FNIRSI LCR-ST1 is a mini smart tweezer tester for fast SMD component identification and measurement. It is designed for electronics repair, PCB assembly, component sorting, and bench troubleshooting where small resistors, capacitors, inductors, diodes, and mixed SMD parts need to be checked directly on or near the board. The LCR-ST1 supports automatic and manual testing, resistance, capacitance, inductance, ESR, diode, continuity, and voltage checks, plus multiple test frequencies for different component types. Its compact tweezer form factor, OLED display, rechargeable battery, and replaceable pointed / hook tweezer heads make it more convenient than using full-size probes on dense SMD layouts. For a similar smart tweezer option, compare it with the ALIENTEK LT1 Smart Tweezer LCR. For soldering and repair work, pair it with the FNIRSI HS02 Smart Soldering Iron, SMD Components Soldering Practice Board, and FNIRSI DSO-TC4 3-in-1 Oscilloscope. Technical Specifications Brand FNIRSI Model LCR-ST1 Product Type Mini smart tweezer LCR / ESR / SMD component tester Supported Tests Resistance, capacitance, inductance, ESR, diode, continuity, and voltage measurement Test Modes Automatic identification and manual measurement modes Test Frequency 100Hz, 120Hz, 1kHz, 10kHz, and 100kHz Resistance Range 0.01Ω to 10MΩ Capacitance Range 1pF to 10mF Inductance Range 1μH to 10H Voltage Measurement DC voltage measurement support Continuity Test Audible / visual continuity check support Display OLED display Tweezer Heads Pointed head and hook head support Power Supply Built-in rechargeable lithium battery Charging Interface USB Type-C Typical Use SMD component sorting, PCB repair, passive component measurement, and quick board diagnostics Integration Notes & Hardware Guidance Discharge capacitors before measuring to reduce false readings and avoid stressing the tester input. For in-circuit measurements, nearby parallel components can affect readings; remove or isolate the part when precision matters. Use lower test frequencies for larger capacitors and inductors, and higher test frequencies for smaller SMD components when appropriate. Clean oxidized pads or component terminals before testing to improve contact stability with the tweezer tips. For independent voltage and current checks, the UNI-T UT61E+ Digital Multimeter is a useful companion meter. Packing List FNIRSI LCR-ST1 smart tweezer tester × 1 Hook tweezer head set × 1 Magnetic patch × 1 USB Type-C charging cable × 1 User manual × 1 Storage / retail package × 1 FAQ What components can the FNIRSI LCR-ST1 test? It can test common SMD and through-hole components including resistors, capacitors, inductors, diodes, and continuity points, with ESR support for capacitor checks. Does it support automatic component identification? Yes. The LCR-ST1 supports automatic identification as well as manual measurement modes for specific test types. Can it measure components directly on a PCB? Yes, but in-circuit readings can be affected by surrounding components. For accurate values, remove or isolate the component where practical. What test frequencies are available? The tester supports 100Hz, 120Hz, 1kHz, 10kHz, and 100kHz test frequencies for different LCR measurement needs. Is it rechargeable? Yes. The LCR-ST1 has a built-in rechargeable lithium battery and charges through a USB Type-C interface.
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