FNIRSI LCR-ST1 Mini Smart Digital Tweezer Tester

The FNIRSI LCR-ST1 is a precision smart tweezer measurement tool developed for advanced testing and analysis of surface-mount electronic components in laboratory, repair and production environments. It integrates multiple measurement functions into a compact tweezer-style form factor, enabling direct contact testing of small and densely packed components. The device supports measurement of resistance, capacitance, inductance, ESR, diode characteristics and circuit continuity, providing comprehensive diagnostic capabilities for modern electronic assemblies.

It operates with three selectable test frequencies (100 Hz, 1 kHz and 10 kHz) and two measurement excitation levels (0.3 V and 0.6 V RMS), allowing flexible adaptation to different component types and measurement conditions. In addition to primary values such as R, L and C, the device calculates advanced electrical parameters including quality factor (Q), dissipation factor (D), impedance (Z), reactance (X) and equivalent series resistance (ESR), enabling detailed component characterization and fault analysis.

The integrated automatic measurement mode identifies the type of connected component and displays both primary and secondary parameters without requiring manual configuration, improving workflow efficiency. A 1.14-inch HD display presents two measurement values simultaneously for faster interpretation, while an intuitive control interface with side dial and silicone buttons enhances usability in precision tasks. Data storage and USB export functionality allow measurement results to be transferred to spreadsheet formats for documentation and analysis.

The device supports interchangeable gold-plated tips, including straight and curved hook-style variants, improving accessibility in tight or complex circuit layouts. A built-in magnetic base enables temporary fixation on metallic surfaces for stable operation during measurement. The compact 41 g design ensures portability, while a 250 mAh rechargeable lithium-ion battery with USB-C charging and automatic power-off function provides efficient energy management.

Performance highlights:
• Smart tweezer design for SMD component testing
• Measures R, L, C, ESR, diode and continuity
• Supports Q, D, Z, X and ESR advanced parameters
• 3 test frequencies: 100 Hz, 1 kHz, 10 kHz
• 0.3 V / 0.6 V RMS test levels
• Automatic component recognition with dual display
• 1.14" HD screen with USB data export
• 250 mAh battery with USB-C charging