Affiliate disclosure

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Some links on this site point to products on Amazon. If you click one of those links and buy something, Amazon pays this site a commission. The price you pay is the same as it would be if you went to Amazon directly, and nothing about your order changes.

What that does and does not affect

• It does not change the price you pay.
• It does not change which products are recommended. A product is linked on a page because it solves the measurement problem described on that page, not because of its commission rate.
• It does not mean a product is the best one available. Where a cheaper or simpler option would do the same job, the page says so.

Other ways to read this site

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Questions

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