Looks like duplicates when first unpacked, but the ink is actually a different color when written. I've included a snapshot of what the tests look like on regular notebook paper so you can all see. The pins look exactly the same so I mark mine with markers on the outside so I don't use the wrong color as even the tips look the same! As you can see on my test sheet, the color difference, especially in the blue, is slight but it's there.
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