Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent - while it lasted

This product was excellent - no, it won't tell you the length of a cable to the nearest CM, but it will give you a decent estimate. The fault detection worked very well, as did port identification. The only problem I ran into was my own fault. A poorly-behaved PoE brick hit my test set with 48 vdc. Here is the reason I don't say 4 stars - rather than have any fuses inline, etc, it just blew. The tester now just turns the screen into black/white quarters, suggesting the internal memory is fried.