I had several of these. The first, after several years of excellent service, failed, got caught in the rain and collapsed; my fault. Got another one and it was stolen. So far this one seems to be just as reliable as the others I've had. Knowing the distance to opens or shorts in wires saves a lot of time. Changing the signal when the wires under test are shorted helps avoid having to have 2 people on hand to troubleshoot bad pairs of low voltage wires or even wiring problems on high voltage lines as long as you are SURE both lines are dead. What ever. It's expensive, but it pays for itself pretty quickly.
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