Hello everybody , last week , i baught a surfmaster PI from à friend and when i read the scheme of it , i can see that the detector worked with eight AA battery size but mine is fitted with only one 9 volts 6F22 battery size , i search all over the web but i don"t found such a detector with this 9 volts 6F22 batteru size ??? what happened ? is my surfmaster a fake one ? or an old version ? it seems to me that 9 volts is too low to give all the power out to the search head , can anyone tell me about my detector supply ? thank you .