The FNIRSI LCR-ST1 is a compact, tweezer-style LCR meter designed for quickly testing SMD and small through-hole components. It combines L/C/R measurement, ESR, and diode/continuity functions in a pen-sized body with a 1.14" color display and built-in rechargeable battery.It’s aimed at electronics hobbyists, repair technicians, and engineers who need fast, one-handed testing of small parts directly on the bench or PCB.

Features :

• All-in-one LCR tweezer tester
  • Measures inductance (L), capacitance (C), resistance (R)
  • Also supports diode and continuity tests
  • Displays ESR, D (dissipation factor), Q (quality factor), Z (impedance) and X (reactance) depending on mode
• Wide measurement ranges
  • Capacitance: 1 pF – 22 mF
  • Inductance: 1 μH – 10 H
  • Resistance: 10 mΩ – 10 MΩ 
• Multiple test frequencies
  • Selectable 100 Hz, 1 kHz, 10 kHz test frequencies for more accurate characterization of components like capacitors and inductors 
• Test voltage levels
  • Two test levels: 0.3 Vrms and 0.6 Vrms, suitable for low-voltage component testing 
• Smart auto-recognition
  • The meter can automatically identify the type of component (R/C/L/diode) and display primary and secondary parameters on screen, reducing setup time. 
• 1.14" color display
  • Clear 1.14" HD color screen shows numerical readings, units, and parameter labels for easy viewing. 
• Portable tweezer design
  • Tweezers allow one-handed picking and measuring of SMD parts
  • Compact body is about 6 × 2.8 × 1.9 cm, making it easy to carry in a pocket or toolkit 
• Interchangeable tweezer tips
  • Comes with two types of tweezer heads:
    • Pointed tips for very small SMD parts
    • Hook tips for slightly larger leads or special shapes
  • Tips are secured with screws and can be swapped without tools. 
• Data storage & PC export
  • The LCR-ST1 automatically saves test records
  • History data can be exported to PC (e.g. into Excel) for logging and analysis 
• Rechargeable battery and USB-C
  • Built-in 250 mAh lithium battery
  • USB Type-C charging port, 5 V input
  • Designed for long-lasting use between charges 
• Convenience functions
  • Auto power-off to save battery
  • Data hold to freeze the current reading
  • History record viewing via PC

Specifications :

• Brand / Model
  • Brand: FNIRSI
  • Model: LCR-ST1 
• Measurement Ranges
  • Capacitance (C): 1 pF – 22 mF
  • Inductance (L): 1 μH – 10 H
  • Resistance (R): 10 mΩ – 10 MΩ
  • Diode: forward voltage up to around 0.7 V 
• Frequencies & Levels
  • Test Frequency: 100 Hz, 1 kHz, 10 kHz
  • Test Voltage Level: 0.3 Vrms, 0.6 Vrms 
• Displayed Parameters
  • L, C, R
  • ESR
  • D (dissipation factor)
  • Q (quality factor)
  • Z (impedance)
  • X (reactive component) 
• Display & Power
  • Display: 1.14" color screen
  • Power: 250 mAh rechargeable lithium battery
  • Charging: USB Type-C, 5 V input 
• Physical / Misc
  • Form factor: handheld tweezer-style LCR meter
  • Replaceable tweezer head: supported
  • Auto shutdown: supported
  • Data hold: supported

Applications :

• Quickly checking SMD resistors, capacitors, and inductors on tape, tray, or directly on a PCB
• Measuring ESR of capacitors in repair work
• Sorting and matching components by value or parameter
• Lab, field, or production line testing where speed and portability matter