FNIRSI LCR-ST2 100 kHz LCR ESR Meter – SMD & Through-Hole Tester with Auto Sort

All-in-One LCR, ESR, and Component Tester

The FNIRSI LCR-ST2 combines LCR, ESR, and diode testing with support for both SMD and through-hole parts, giving you a single tool to verify a wide range of components. It measures resistors, capacitors, inductors, diodes, and checks continuity and voltage. Smart auto sorting helps highlight parts that deviate from expectations, so you can triage boards more efficiently. A full-range scan covers 100 Hz to 100 kHz, enabling rapid evaluation from RF components to large electrolytics.

Precision testing that aligns with real-world needs

With four RMS test levels (0.1, 0.3, 0.6, 1.0 V) and both series and parallel modes, the instrument minimizes parasitic effects while delivering consistent, actionable data. You can measure capacitors from 1 pF to 22 mF, resistors from 10 mΩ to 10 MΩ, inductors from 1 μH to 10 H, diodes with forward drop up to about 0.7 V, and voltage up to ±30 V. A straightforward continuity check rounds out quick diagnostics for boards in development or repair.

Clear, layered readings for thorough analysis

The LCR-ST2 presents both primary and secondary readings automatically. Core parameters (R, C, L, Z) appear alongside secondary metrics (X, D, Q, θ), giving you a richer picture of component behavior and consistency across tests. This dual readout supports side-by-side comparison and deeper insight when selecting replacements or validating assemblies.

Designed for comfort, readability, and mobility

The device offers a left- or right-hand mode, a bright 1.47" HD display, and adjustable brightness to suit your working environment. A built-in 300 mAh rechargeable battery powered via USB Type-C keeps you productive away from the bench, with an automatic power-off to extend runtime. A strong rear magnet helps keep the meter secure on steel surfaces or workbenches, reducing drift and freeing your hands for precise testing.

Complete kit for on-demand testing

Beyond the meter body, the LCR-ST2 ships with a versatile kit: Kelvin clips for reliable four-point testing, gold-plated tweezer tips for precise component handling, and hooks for easy connections. The quick plug-and-swap design lets you switch probes fast for different components, and the included storage pouch helps you stay organized on-site or in the lab.

What you gain

• One tool for SMD and through-hole tests across R, C, L, and more
• Auto sorting to speed triage and verification
• Wide frequency sweep for RF to large electrolytic components

• Precise ranges and multi-mode testing to minimize parasitic effects
• Clear primary and secondary readings for thorough analysis
• Portable kit with probes, clips, and pouch for field use

These features describe possibilities for improving accuracy, speed, and workflow in electronics testing; actual results depend on components and usage conditions.