and many posters say not to rely on the pens in a life and death situation. Consequently, because I was waiting for my supplier to phone me back, and not really expecting them to, I ordered a Digital Clamp Meter. However, they did phone me back and will hopefully fix the problem, but if the Clamp Meter works properly, then it will be useful for identifying any future supply problems.A clamp meter has to be 'clamped' about just one of the conductors/'wires' (Neutral or Live/Line). If you clamp it around a whole cable (containing both the L and N conductors/wires), even if high current is flowing, that in one conductor should 'cancel' that in the other, resulting in a 'zero', or nearly zero, reading.
the Martindale NC1 which did both solenoid and voltage and found it very good, hope the new owner does, who ever it was.
these will detect cables buried under the ground to quite a depth, often called cable avoidance tools, and cable trackers 
normally come in two parts sender and receiver, it all depends on what you want it for? I have tried this type 
to be frank not that good, but better than a pen type. I would say likely the two section type do work best for finding cable break, but each has its place.They are not Ok for that use either in that they can show that the pipe is live even when it's visibly connected directly to the nearby main earthing terminal, due to coupling between nearby wiring and the user's body.
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