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The Model 527 is designed both for rugged durability and ease of use, with LCD and audio response to setup and testing. IN A GREET CONDITION. The Model 527 ISDN Test Unit allows you to establish a loopback on either B channel.
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.