LCR-T4 ESR Meter & Transistor Component Tester

The LCR-T4 is a powerful all-in-one component tester and ESR meter built on the ATmega328 microcontroller, designed to rapidly identify and measure a wide range of electronic components with just a single button press. Whether you’re a hobbyist debugging circuits or a technician sorting through component bins, this compact tool eliminates the guesswork by automatically detecting the component type and displaying its key parameters on a crisp 128×64 backlit LCD in under two seconds.

The LCR-T4 auto-identifies NPN and PNP transistors, N-channel and P-channel MOSFETs, diodes, dual diodes, Zener diodes, Darlington transistors, thyristors (SCRs), triacs, voltage regulators, LEDs, resistors, capacitors, inductors, and adjustable potentiometers — all without any manual range selection. It measures capacitance from 25pF to 100,000µF, resistance up to 50MΩ with 0.1Ω resolution, and inductance from 0.01mH to 20H. For capacitors above 2µF, it simultaneously displays the ESR value with 0.01Ω resolution.

Powered by a standard 9V battery (not included) and featuring an ultra-low 20nA shutdown current, it is extremely energy efficient for everyday bench use.

Specification :

• Model : LCR-T4
• Microcontroller : ATmega328
• Display : 128 × 64 LCD with Green Backlight
• Test Speed : ~2 seconds (up to 1 minute for large capacitors)
• Detectable Components : NPN/PNP Transistors, N/P-Channel MOSFET, Diode, Dual Diode, Zener Diode, Darlington, Thyristor (SCR), Triac, LED, Resistor, Capacitor, Inductor, Potentiometer, Voltage Regulator
• Capacitance Range : 25pF – 100,000µF (Resolution: 1pF)
• Resistance Range : 0.1Ω – 50MΩ (Resolution: 0.1Ω)
• Inductance Range : 0.01mH – 20H
• ESR Measurement : Yes (for capacitors ≥ 2µF, Resolution: 0.01Ω)
• Zener Detection : Reverse breakdown voltage up to 4.5V
• Operating Current : ~25mA
• Shutdown Current : 20nA
• Power Supply : 9V battery (6F22) or 2× Li-ion (8.4V)
• Standby Current : 0.02µA