Iodine for Testing Free SO2 (Ripper Method)

I bought some equipment to test for Free SO2. The test calls for Iodine (.02N). I don't know how to translate the .02N to a percentage of iodine solution. I have three products with iodine in them. Will any work? Do I add water to an amount of the iodine product to get the right concentration?

Io Star Sanitizer (1.6% iodine)
Povidone Iodine (equivalent to 1% iodine)
Iodine Tincture USP (2% iodine)

Thanks!
Dave

whomever sold you the test equipment will have the SO2 titrate in the proper strength to do the test. Suggest purchase from them. Calculation of Free SO2 is dependent on titrate strength.

Can you post the instructions that came with the equipment?