You can use any Minelab PI coil on the QED successfully.Don in SoCal said:Does the QED have a sufficient coil selection? Minelabs have a wide range of coils available both in house and after market. The TDI was produced with the intent that the coils which mate to the SD/GPX series could be useable. The compatibility of these coils to the TDI is somewhat sketchy and that in itself could be a whole new topic.
Regards, Ian.