Dilute your strong solution by a factor of (Say) ten with de-ionised water 
and test that, multiply the test result by (say) ten to get the real 
strength.
Ruary
> One question I have is how to test for the level of available chlorine,
> As I use the same solution to sterilize one piece after another,
> I would need to keep the available chlorine above a certain strength for 
> it
> to be effective, and the available testing kits (for other purposes) only
> test at a much lower range of concentration.

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