Knudsen Engineering Limited:

320B The 320B Blackbox series of echosounders are compact versions of the 320M system. The 320B series has the same functionality of the 320M, minus the printer.
320BP The 320BP system is housed in a portable, rugged, splashproof / shockproof ABS/polycarbonate case. Ideally suited to small open boat applications, it is also excellent for general purpose use.
320BR The 320BR is a rackmounted high power system for full ocean depth surveys.
320M The 320M Marine Echosounder available as a single or dual frequency model. It includes unique features such as a SCSI port, a built-in 32 level grey scale printer, and field programmable software that allows system upgrade or reconfiguration to new frequencies.
320MP The 320MP is a splashproof version of the 320M in a rugged plastic case.
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