The most common method to measure needle size is by using a needle gauge.
Here's a breakdown:
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Needle Gauge: A needle gauge is a tool containing holes of various sizes. You insert the needle into the holes until you find the smallest hole through which it can pass. The corresponding number or marking associated with that hole indicates the needle's size, usually expressed as a gauge number.
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Gauge Number Inconsistencies: It's important to note that gauge numbers can sometimes be inconsistent between different manufacturers or even different types of needles (e.g., knitting needles versus sewing needles). The gauge number doesn't directly correlate to a specific measurement like diameter in millimeters.
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Potential for Error: Because you are fitting the needle through holes, it is possible that a needle that is slightly bigger than the hole will then be measured in the next size up.
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Alternative Methods: While gauges are standard, some needles might also be labeled with their diameter in millimeters, especially in scientific or medical contexts.
