Not Ranked
I recently used mine to check my sidepipes that were getting very loud & discovered that they no longer had any packing in them.
Great tool to have around, I also had a look in the cylinders through the plug holes. Mine has a mirror attachment that allows you to view 90deg. angles.
Some of these units have much larger cables than others, so if you are contemplating a purchase, compare them all first. The quality varies considerably.
Craig
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