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There are lots of inexpensive component tester modules available,  easily recognised by an LCD screen, a 'test' button and a 14-pole quick-release socket.

3D Printed Component TesterDespite being extremely cheap, these testers are great for checking all sorts of components with2 or 3 terminals, including:

  • Resistors
  • Capacitors
  • Inductors
  • Diodes
  • Low voltage Zener diodes
  • Bipolar Transistors
  • Field Effect Transistors

They can even give details like the gate capacitance of MOSFETs and the ESR of capacitors above 2uF!

Unfortunately the bare module is a bit clumsy, but if you have a 3D printer you can use the STL files on this page to print a case that even includes a clip for an internal 9v battery! All you have to add are three M3 x 10mm long cap screws to keep the two parts together!

Download STL for the top of the box print this part face down with no support for best results.

 Download STL of the base of the box with battery clip

Component Tester

You can purchase the Component Tester Module from Amazon, this is one of the cheaper options:


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