Use Indigo® pH 10-13 test strips on your medium to strong alkaline solutions. These pH 10-13 strips work well with sodium hydroxide and sodium carbonate. Safe shopping for best bang for the buck? Buy just 3 & beat "free" shipping offers.
Maple syrup producers clean their nylon filters & with alkali solutions that should be in the 11-12 range. Film developers also use these strips to ensure their accelerator solution is optimized for grain size & image contrast.
They can be used to test your aquarium pH increaser solutions made from NaOH (lye). You can also use it for science fair experiments to test the buffering capacity of milk of magnesia which is used to reduce heartburn (indigestion) due to excess stomach acid production or to measure chlorine bleach which is in the range of 11-13..
Test Strip Documentation
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