PDF User Manual for MFJ-203 (MFJ 203 MFJ203) :
MFJ-203 (MFJ 203 MFJ203) technical specifications :
The MFJ-203 bandswitch dip meter covers 1.75 to 33 MHz in five ranges. It is a solid-state adaptation of the traditional grid dip meter. It does not need a set of external tuning coils. It can be used for a variety of accurate measurements of many different RF circuits.
Jacks on the top include: Coupling Coil (phono), Frequency Out (phono) and DC Input (2.1 mm)
Requires one 9 volt battery (not supplied) or MFJ-1312D.
Measures 2.5x7x2.5 inches.