....................I had one of these when they were brand new back in 1985 or so!! I never liked the factory made battery system so I will change this to a 9-volt system!! Will probably change the rod set up to an S-style rod and mount the meter on the end of the handle!! I am gathering the parts as I speak............found a Whites's DI meter..............also a 10 inch Hot Head Coil that works on the Teknetics....................Anyone have an S-Style rod that can be adaptable for mounting a Whites DI meter??.............Any comments or suggestions would be appreciated!! Thanks Joe..........................................................................Just wanted to backtrack a little bit..................I collect detector so over the years I have had several Teknetics including at least 2 Mark 1's, an 8500 and several of the Big Bud's...............I sell/trade/buy all of the time so all of these were sold years ago..............I like to look at the Modification Forums so looking at some of the Refits.....I was inspired...............looking thru all of my assorted detector accessories..........I found several Teknetics Coils that I have kept for some strange reason............so I reasoned that all I needed is the Control Box ........so i put some WTB ads in some of the Classified Forums and found one........It is a Mark 1 Limited which is the one with the Red Box and I believe that the TID meter is a bit more colorful...........Still deciding whether to mount the S-Rod on the Control Box or convert it to a Chest/Hip Mount System.................have most of the parts........except for the S-Rod.........right now i am gathering all of the tools..............found some hobby type razor/knifes..........need to cut out some more room in the battery area to make room for the 9 Volt Batteries and for the one 2 pack AA cell holder..........may also get a Dremel......but holding off till I get a bit more Info..............HH.......Joe