I really only bought this because I wanted a cheap, easy to use and simple fuse tester. Spare fuses would be a bonus for me. The fuse tester works pretty well, does what I need. As mentioned in previous reviews, the fuses that came with this set were terrible. The quality is very crappy and the metal pins don't even reach the tip as is usually the case with some Bussmann fuses that have higher quality fuses. This was a disappointment but a small one for me as I wanted to use a backup detector. For the price I was quite happy. But don't expect fuses to be worth anything, you can't even test them from above with the included tester. You have to touch the actual contacts on the bottom to check the fuses.