Delay specifications for Nanoverb and Nanoverb 2

I am considering buying a used Nanoverb or Nanoverb 2 unit off of e-Bay. I am only looking for a small amount of total delay (10 to 30 ms) for manual calibration and subtle ambience effects with surround speakers on a vintage home audio and video system.

What is the lowest delay threshold at the output jack for each unit when the adjust knob is at its lowest setting and what are the delay increments in milliseconds for each "click" of the adjust knob for each unit? Thanks.
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