Hello,
I have bought this small device ($22 shipped):
![](http://sorenkir.free.fr/ESR02/Box.jpg)
![](http://sorenkir.free.fr/ESR02/ESR02_Pro.jpg)
It is cute (wine red box, as stated on the box, I like that
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/xwink.gif.pagespeed.ic.cldandycH0.png)
) and well thought: external 9-12V DC jack, test probes jacks, SMD socket, plug-in sockets, discharge resistor, ESR chart (on the back).
The two buttons have the same function: for left & right handed
![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif.pagespeed.ce._hfWAz_QHO.gif)
.
A few additional functions:
![](http://sorenkir.free.fr/ESR02/Additional_Functions_1.jpg)
![](http://sorenkir.free.fr/ESR02/Additional_Functions_2.jpg)
The most useful is the "continuous" capacitance/ESR meter (C+ESR): no need to press the button for measurements.
Even a decent "user manual" is provided:
![](http://sorenkir.free.fr/ESR02/User_Manual.jpg)
Don't turn it on, take it apart:
![](http://sorenkir.free.fr/ESR02/Inside.jpg)
Atmel MEGA328P, LM339 comparator, AMS1117 3.3V & HT7150-1 5V LDO regulators:
![](http://sorenkir.free.fr/ESR02/PCB.jpg)
Quick test:
330? resistor:
![](http://sorenkir.free.fr/ESR02/Resistor.jpg)
10mH inductor:
![](http://sorenkir.free.fr/ESR02/Inductor.jpg)
SMD 1mH inductor:
![](http://sorenkir.free.fr/ESR02/SMD_Inductor.jpg)
White LED:
![](http://sorenkir.free.fr/ESR02/LED.jpg)
470 uF capacitor:
![](http://sorenkir.free.fr/ESR02/Electrolytic_Cap.jpg)
Transistors:
![](http://sorenkir.free.fr/ESR02/Bipolar_Transistor.jpg)
![](http://sorenkir.free.fr/ESR02/JFET.jpg)
Not impressed by a big power NMOS:
![](http://sorenkir.free.fr/ESR02/NMOS.jpg)
No accuracy specification but measured values roughly agree with other instruments I have. Ideal for component identification.
Michel.