Test Frequency

100 kHz reveals capacitor ESR and power inductor behaviour; 1 kHz and 10 kHz are enough for sorting general parts.

Secondary Parameters

ESR, D (dissipation), Q and phase angle tell you if a part is healthy, not just its nominal value.

Fixtures and Kelvin Leads

4-wire Kelvin clips and SMD tweezers remove lead resistance, which matters for low-value parts.

Open and Short Calibration

Zeroing out the test leads before measuring small capacitors and inductors keeps readings honest.

Auto Identification

Component testers find the part type and its pins for you, ideal for unmarked or salvaged parts.

The ET430 gives you most of what the DE-5000 does for less. It tests at six frequencies, including a useful 40 kHz step between 10 kHz and 100 kHz, reads primary and secondary parameters together and quotes 0.3% basic accuracy. Ranges are wide (inductance to 2000 H, capacitance to 20 mF, resistance to 200 MΩ), so it handles everything from tiny RF inductors to bulk capacitors on an ESP32 power stage.

The LC1020E is the most modern meter here to use. A bright 2.8-inch colour TFT shows the main and secondary readings (ESR, Q, D, θ and X) together, and it brings bench features to a handheld: selectable test voltage, DC bias, 4-terminal Kelvin jacks, a component socket, open and short calibration and a sorting mode with pass and fail alerts. It charges over USB-C, so it lives happily on a desk next to your ESP32 dev boards.

The UT612 is a well-rounded 100 kHz handheld from a brand many makers already trust for multimeters. It measures L, C, R and DCR with D, Q, θ and ESR, supports series and parallel equivalent circuits, and its USB interface logs readings to a PC, which is handy when you are checking a batch of inductors for a run of ESP32 sensor boards. It can also run from USB power during long sessions.

The UK-made LCR45 works differently from the handhelds above. It picks the best test frequency automatically (up to 200 kHz) and shows the complex impedance of the part, which makes it excellent for small inductors, RF chokes and hand-wound coils, such as the ones you might use in an ESP32 wireless charging or antenna experiment. Its accuracy is lower than the DE-5000, but it is fast, simple and very well built.

The LCR-P1 is the classic “drop it in the socket and press test” component tester, updated with a colour screen and a rechargeable battery. It identifies the part and its pins automatically and measures transistor gain (10 to 600), capacitance from 25 pF to 100 mF, resistance from 0.01 Ω to 50 MΩ and inductance from 10 µH to 1000 µH. It also checks diodes, zeners up to 32 V on a separate channel, MOSFETs, thyristors and batteries, decodes NEC IR remotes and discharges capacitors before testing to protect itself. It is perfect for sorting the transistors and MOSFETs you use to drive relays and LED strips from ESP32 GPIO pins.

8. Peak Atlas DCA75 Pro

A big step up from the LCR-P1 for anyone who works with discrete semiconductors. The DCA Pro identifies bipolar transistors, MOSFETs, JFETs, IGBTs, diodes and LEDs, works out the pinout, and measures parameters such as gain, leakage and gate threshold on a graphic colour display. Connect it to a PC over USB and Peak’s software plots curves for the part under test. It is ideal for matching transistors or checking the MOSFET that switches a motor or heater from an ESP32.

9. Peak Atlas ESR70

A dedicated capacitance and ESR meter for electrolytic capacitors. It measures ESR from 0.00 Ω to 40 Ω and capacitance from 1 µF to 22,000 µF, with an audible alert, and is designed for quick checks of the bulk capacitors that smooth power supplies. If your ESP32 project resets under load or a USB power supply has started to whine, this is a quick way to find a dried-out capacitor.

One serious LCR meter

The DER EE DE-5000: 100 kHz, ESR, sorting and Kelvin inputs.

100 kHz for less

The East Tester ET430 or the colour-screen FNIRSI LC1020E.

Lots of SMD work

The FNIRSI LCR-ST1 tweezers, alongside a main meter.

Identify unknown parts cheaply

The FNIRSI LCR-P1, or the Peak Atlas DCA75 Pro for deeper analysis.

Do I need an LCR meter if I already own a multimeter?

For most ESP32 projects, a multimeter is enough to start. An LCR meter becomes worth it when you design your own power supplies, build boards with inductors, repair gear with suspect capacitors or need values like ESR and Q that a multimeter cannot measure. Our multimeter guide covers the basics first.

Which test frequency should I use?

Use 100 Hz or 120 Hz for large electrolytic capacitors, 1 kHz for general parts, and 10 kHz to 100 kHz for small capacitors, ceramic decoupling caps, power inductors and ESR checks. When in doubt, measure close to the frequency the part sees in your circuit.

Should I use series or parallel mode?

Series mode suits low impedances (large capacitors, small inductors, low-value resistors). Parallel mode suits high impedances (small capacitors, large inductors). Most meters here pick a sensible default in auto mode.

Can I measure parts while they are still on the ESP32 board?

Generally no. Other components in parallel change the reading. Dedicated ESR meters like the Peak Atlas ESR70 are built for quick checks on capacitors, but for exact values lift one leg of the part, or remove it with a hot air rework station.

Why do I need open and short calibration?

Test leads and fixtures add their own capacitance, inductance and resistance. Calibrating with the leads open and then shorted subtracts those values, which matters when you measure picofarads, microhenries or milliohms.