rpm

Not to get into an argument, but the meaning of "immeasurable" is too large, extensive, or extreme to measure. Or, so large or great that it cannot be measured or known exactly. I believe that is the exact opposite of what you were trying to convey.

http://dictionary.cambridge.org/us/dictionary/english/immeasurable

ex·treme

ex·treme [ik strm]
adj
1. great or intense: highest in intensity or degree
will withstand extreme pressure

2. not reasonable: going far beyond what is reasonable, moderate, or normal
an extreme reaction
the extreme right wing of the party

And "extremely low" would work too, I think.

OK, what's the word I'm looking for that says "too small to measurer."
 
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