rivet counter
n.— «North End Train Center has some intense customers who Colley likes to call “rivet counters.” These are collectors who won’t buy an item unless it is absolutely correct and to perfect scale.» —“Small Business Scene: Miniature railroad store caters to one-track minds” Seattle Post Intelligencer (Washington) Dec. 11, 2008. (source: Double-Tongued Dictionary)
Further reading
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Enthusiastic book recommendations! Martha’s savoring the biography of Alexander von Humboldt, the 19th-century explorer, polymath, and naturalist who revolutionized our understanding of nature and predicted the effects of human activity on...