Test plugs are used to check the assembly of a male or female MC4® coupler to ensure the contact is in the correct location within the insulation. These are not designed for electrical output testing, visit our Electrical Testing page for options there. 

If the contact is assembled correctly, the colored mark on the test plug will still be visible. 

Now available in two options:

• Staubli PV-PST Uses a white mark for correct assembly reference
• Solar Tools USA designed to be more compact, lightweight, and by your side with included retractable clip. Uses a red mark for correct assembly reference