Although their single crackpipe toner is the most reliable, a pack of 8 almost goes with it. but they had a serious problem with the copper engraving on the cable IDs. Spines on them break very easily. I've even always kept them in barrels, but you have to be very careful when putting them on the wallboard for the tone. If there is even a hint of paint or dirt, the tip will break off. You won't notice until you try to use it again and that particular ID won't sound. Look at the sting and of course I made the mistake of buying a second time because I left the mapper in the attic. Work. On the third job after receiving a replacement, the same thing happened to one of the identifiers. Yes. $100 shame on me.
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