While most (all?) of you seem to have proper test equipment such as DMM, scope, LA, this little gadget can still be quite handy. It has two analog input channels as well as 2 analog output channels that can be either a voltage source (0 - 5V) or a current source (+/- 200ma). Great for testing components, curve traces, matching transistors etc, and only about $50.
And for the record, no I do not have any affiliation with Analog Devices.
And here’s a video you might find interesting that also demonstrates the ADALM1000.
Intro to Transistors Lab with the ADALM1000
Update: There is also the ADALM2000. It’s a little more expensive but a much more capable device. Dual channel 20MHz digital oscilloscope, dual channel 20MHz arbitrary waveform generator, 20MHz spectrum analyzer, function generator, and 16 channel 100MHz logic analyzer and pattern generator and more. It’s new and should become available in the next week or so.