Funnily enough I need one as well but not sure about a s/h one? I may go for new but what are the good makes I dont use it much but at the same time it needs to be good or it’s pointless
If you can afford it, get a signal generator too, that way you can clip on and actively look for services rather than a passive sweep. You can also get a mouse to push up ducting and drains etc
One thing I never realised, is that the tool will only pick up a signal if the service is in use, so switch on whatever you are looking for to draw plenty of current through it and get a good signal. Just because a cable is live, it won't give off a great signal unless it is using power, for example a cable supplying a barn may be live, but unless the lights are switched on it may not give much signal.
Also an interesting thing I learnt is that in radio mode, you are picking up low frequency radio waves the military are transmitting to submarines and the metal object in the ground is re-radiating that signal
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