Firstly, I know how to use this tool properly, I am a jeweler. I know it's a narrow hole, not a round area measuring metal. In addition, both devices should be suitable for both wire and sheet measurements, since jewelers also use these types of instruments to measure sheet thickness. Unfortunately, both of the tools provided were inaccurate, as the 18-gauge piece of metal I first checked with my high-end Japanese calipers both fit the 18-gauge slot (loosely) and is tighter in the 19-gauge slot (how it should be). fit an 18 gauge slot if you understand my drift). IMHO the metal shouldn't fit in the groove less than its diameter. I got an exact bag size from a jewelry supplier but I wanted a full size, I think I have to pay a higher price from the jewelry supplier. Lesson learned.
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