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For DTL, TTL and CMOS - High Frequescy Response. For TTL and DTL, set the upper select switch to the side marked "TIL". The LEDs will indicate its logic states Fuse and Limit. Circuit Breakers & Fuse Boxes.
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.