The market has been flooded with counterfeit products that closely resemble the originals at this point to where you have to send them back to the manufacturer to be authenticated. If you're mainly working with low-voltage applications (like vehicles), these fuses might still provide some protection for both the meter and yourself. It wouldn't surprise me if many eBay sellers unknowingly source these counterfeit items due to tainted supply chains.
For meters where I'm not dealing with situations that could cause a catastrophic failure, I typically replace the fuse with a non-ceramic fast-blowing fuse of similar amperage but a much lower voltage rating. I then mark the meter accordingly for its intended use.
Chinese-made and fake fuses have heavily infiltrated the market. Back in 2007, Harbor Freight sold fuses that didn't blow, resulting in vehicle wiring fires. Amazon has since become another major distributor of garbage fake or counterfeit products.
Fuses are particularly attractive to counterfeiters because, most of the time, they don't seem to do much. I once bought fuses from a well-known local auto parts store, only to find out they were fake after I did some bench testing because I observed they didn't fit quite as well dimensionally as the old ones. The manufacturer had me return them, and soon after, those fuses were pulled off shelves regionally from what they told me.
