The FNIRSI LCR-ST1 is a multi-functional clamp meter for testing surface mounted electronic components. It supports resistance, capacitance, inductance, ESR, diode testing and circuit continuity measurement. The device offers 3 test frequencies (100 Hz, 1 kHz, 10 kHz), 0.3 V and 0.6 V rms test levels, as well as display of additional parameters such as Q, D, Z and X. Thanks to its compact design, interchangeable connectors and USB-C interface, the device is ideal for laboratory, service and production applications.
The device automatically recognizes the type of the tested component and displays both the main and additional parameters. This solution facilitates working with multiple components and eliminates the need for manual mode switching. The meter supports English and Chinese.
The FNIRSI LCR-ST1 meter measures not only basic values ​​(R, L, C), but also loss factor (D), impedance (Z), quality factor (Q), reactance (X) and equivalent series resistance (ESR). This functionality enables comprehensive diagnostics of components. Measurement ranges include capacitance from 1 pF to 22 mF, inductance from 1 µH to 10 H, and resistance from 10 mΩ to 10 MΩ.
The 1.14" HD display displays data in an easy-to-read manner. Intuitive menus, silicone-covered buttons and a side dial improve handling. In addition, the data storage function allows you to export measurements to an Excel file via USB. The display shows 2 measurement parameters at the same time, speeding up the analysis. The gold-plated tips of the tweezers are replaceable - the set includes a classic straight tip and a curved "hook" type. This makes the device suitable for many applications - including hard-to-reach places. The built-in magnet allows you to temporarily stick the meter to metal surfaces.
The 250 mAh rechargeable lithium-ion battery ensures a long operating time, and charging is done via a USB-C port. The auto-off function saves power when there is no activity. The whole thing weighs only 41 grams, making the device comfortable to carry.

- Model LCR-ST1
- Display Color screen 1.14"
- Charging interface USB Type-C, 5V/1A
- Power supply 250 mAh rechargeable lithium battery
- Dimensions 28 × 19 × 150 mm
- Weight 41 g
- Capacitance measurement range 1 mF 22 mF (100 Hz, 1 kHz ±5%)
- 1 µF 1 mF (100 Hz, 1 kHz, 10 kHz ±2%)
- 1 nF 1 µF (100 Hz ±2%, 1 kHz and 10 kHz ±0.5%)
- 1 pF 1 nF (1 kHz and 10 kHz ±2%)
- Inductance measurement range 1 H 10 H (100 Hz, 1 kHz ±5%)
- 1 mH 1 H (all frequencies ±2%)
- 10 µH 1 mH (100 Hz ±2%, 1 kHz and 10 kHz ±0.5%)
- 1 µH 10 µH (10 kHz ±2%)
- Resistance measurement range 1 MΩ 10 MΩ (100 Hz, 1 kHz ±5%)
- 1 kΩ 1 MΩ (100 Hz, 10 kHz ±1%, 1 kHz ±0.5%)
- 1 Ω 1 kΩ (all frequencies ±0.5-1%)
- 10 mΩ 1 Ω (all frequencies ±2%)
- Diode test Driving voltage: 0.7 V