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The counter works and is pretty accurate. You can see in the photos the frequency matches that of my signal generator source. I tested it both as a straight frequency counter and with a TS-520S; you can see the results in the photos.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.