I'm trying to test edlc super capacitors for esr and it's not working, is that expected?

It probably will take a long time. I also have tested 1000uf capacitors with it. I don't know what voltage is presented to the capacitor. You might want to test the voltage across the capacitor. If you are trying to test 2.7 volt caps and the test voltage is 9 volts probably destruction.

What's the low end limit of the capacitance measurement range?

The description says "Can measure capacitance of 30pF-100mF , resolution 1pF". I haven't tested it.

Is there a link to an instruction sheet?

I don't know of an instruction manual specific to this particular tester, but they all work about the same way: connect a component to the socket and hit the Test button. It can't give you all the specifications on a part, but it can determine the pinout of a diode or transistor accurately.

Can this meter be used as an ESR meter for testing caps 'in-circuit'?

Yes, you can test capacitors in circuit. I have found however, that to get a more accurate reading it is best to remove it from the circuit. When testing a component in circuit the result is not always accurate. This is to be expected. I still find this item to be very handy and a bargain.

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Aideepen Transistor Tester LCR Meter, NPN PNP MOSFET Diode Resistor Inductor Capacitance ESR Automatic Checker Detector

Aideepen Transistor Tester LCR Meter, NPN PNP MOSFET Diode Resistor Inductor Capacitance ESR Automatic Checker Detector

Product ID: 466066660

Details

Brand
Aideepen
Power Source
Battery
Style
Digital Simple
Colour
LCR-Black
Item Weight
99 Grams

⚡Auto-detects NPN/PNP, MOSFET, diodes

📊1.8" TFT color display

⏱️2-second rapid testing

$131.02

Duties & taxes included

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Description

⚙️ Test Smarter, Not Harder — The Ultimate Transistor Sidekick

PORTABLE READY - Lightweight 99g build with protective casing, plus 3 test leads and battery included—perfect for on-the-go pros.
VIVID COLOR DISPLAY - 1.8-inch high-res TFT screen with color-coded parameters for instant clarity and precision.
SMART AUTO DETECTION - Automatically identifies transistor types, MOSFET channels, diodes, resistors, capacitors, and more—no manual setup needed.
LIGHTNING FAST RESULTS - Complete component tests in just 2 seconds, accelerating your workflow and leaving competitors behind.
POWER EFFICIENT DESIGN - Includes a replaceable 9V battery with auto shut-down and countdown timer to maximize battery life and reliability.

The Aideepen Transistor Tester LCR Meter is a compact, battery-powered device featuring a vibrant 1.8" TFT color display that automatically detects and measures a wide range of components including NPN/PNP transistors, MOSFETs, diodes, resistors, capacitors, and inductors. With rapid 2-second testing, auto pin detection, and an energy-saving auto shut-down function, it’s engineered for precision and efficiency. Lightweight and portable, it comes complete with a 9V battery and test leads, making it an indispensable tool for electronics professionals and hobbyists alike.

Specifications

Brand	Aideepen
Power Source	Battery Powered
Style	Digital,Simple
Colour	LCR-Black
Item Weight	99 Grams
Min. Operating Voltage	9 Volts
Specification Met	CE
Measurement Type	Multimeter
Manufacturer	Aideepen
Country of Origin	USA
Model number	LCR Meter
Number of Memory Sticks	1
Item Weight	99 g
Package Dimensions	14.71 x 12.19 x 3.2 cm; 99 g
Batteries	1 9V batteries required. (included)
Item model number	LCR Meter
Voltage	9 Volts
Included Components	no
Are batteries included?	Yes

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