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/diy/ - Do It Yourself

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>> No.1931290 [View]
File: 2.71 MB, 4000x3000, IMG_20201016_150901488.jpg [View same] [iqdb] [saucenao] [google]
1931290

What's the correct way to measure threads-per-inch? I've been told to measure one inch from a peak in the thread and count how many there are not including the first peak. I just recently was told to measure one inch starting from a valley and count the peaks. Which is correct? Pic semi related, 7tpi?

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