EISTAR SJ-1 Signal Injector?

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alhoop

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I have an EISTAR SJ-1 that looks like a logic probe but seems to be a signal injector with an open collector output and 4 dip switches that seem to give a frequency out of 1hz to to 16M in 9 steps depending on the dip switch setting. Does any one have any info on this?
Thanks
A

PS never could find any thing on this other than one dealer who has 33 for sale.

Testing it showed the following : square wave output from 1hz to 1mhz in seven decade steps, stpe 8 is 8mhz and step 9 is 16mhz.
Roundoff occurs from 1mhz onwards but is probably a result of my test setup. What a find that I've had stored away for 20 years!l
 
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