The unit uses a PID temperature controller, an SSR (Solid State Relay) and a transformer plus a metal enclosure case, a soldering stand and a few other parts. This homemade unit is not as responsive as one of the commercially manufactured ones like a Weller or a Hakko, but it works surprisingly good. Displaying the pin out is very useful if you just want to double check a component as there are so many variations with transistors.For the cost this alone would make alone of the most useful electronic test equipment kits that I have come across.
Inductance can also be measured in exactly the same way, just connect it up to either terminals 1, 2 or 3 and it will identify and measure it. Having built various electronic test equipment kits over the years I can easily say that this is the best component tester and measurer that I have ever built.
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The PID controller was designed primarily for manufacturing process control, but it was easy enough to adapt it for use in a soldering station.
Polarity doesn’t matter but you need to make sure that they are properly discharged before you connect them as you can damage the tester if you don’t.

Shown below are pictures of a diode and a zener diode being tested, as well as MOSFET’s, JFET’s and thyristors. If you wanted to you could connect up a custom socket or leads as there are pads available clearly marked you could solder to. Accompanying this post is a series of videos showing how to optimize the PID controller and get the best performance from it. There are several designs based on traditional techniques of basically substituting the transistor on test into the circuit and lighting an LED or something to indicate that it was working correctly. You just have to solder on the push button, battery connector, socket and then bolt on the display module and solder that.
The problem was that for testing PNP and NPN and the different lead layouts meant it wasn’t going to be as straight forward as I’d first thought.What I eventually found was far better than I ever could have imagined, hoped or believed possible. I’m not sure what the actual accuracy is but as you can see from the picture below the 100 ohm resistor is actually reading 977.9 ohms so you could match resistor values easily with that resolution. I intend to do this when I finally get around to it.The completed kit has a zero insertion force socket with various numbers around the edge of it.

I can’t imagine anyone who’s interested in electronics not to be impressed.It's worth noting that this item in a very similar form is available from Amazon as a pre-built item direct from the UK.
As electronic test equipment kits go I find it hard to fault this one.Imagine a device that had a test socket that had multiple connections on it and it didn’t matter which component legs connected to which.
1,2 and 3 all you have to do is make sure that the three transistor terminals each connect to a 1,2 and 3.
Imagine if you didn’t even know what the device was and you just pressed a button and got the results on screen.
It informs you of the emitter threshold voltage and the current amplification factor, whether the transistor is PNP or NPN and the pin out.

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