Inside View
The Victoreen Instrument Co.
CD V-710 Model 3
(Second from left in top picture)
Uses 1 "D" size 1 ½ volt battery and 2 "B" size (Neda Type 215) 22 ½ volt batteries.
This unit has a plastic case with schematic on the inside.
The handle is aluminum, and uses 6 screws to hold case together.