We have resorted to using the ole trick of taking two flag wires and bending a 90degree on the ends to hold in your hands. I was pretty surprised to find that it sorta works. But like the use of the valve finder521 there are probably some tricks to using these wires. Do you have to get a static charge on them first, or do they work better if grounded and charge off them. Just in case you are wondering what the problem is.....got water on some media but can't find the valve box. Have wiring into the media and used 521 to track wires but nothing then used volt meter across wires to gnd and nothing. There may not be valve boxes but seems unusal that they would put in th rotor and no valve boxes. Definitely water into area found the line but rocky texas soil not practical to dig down the water line in heat.