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ACID TEST PAPERS - IODINE SKU: TP-050-I Price: $2.55
Measures available iodine in a range between 12.5 p.p.m. and 50 p.p.m.
Accurate in daylight conditions. 100 papers.

Procedure:
Dip a glass rod into your iodine based sanitizing solution.
Allow 1-2 drops to flow onto litmus paper 1/2" from the end.
Shake off the excess liquid.