Base pH 10-13 Test Strips, 50/Pack

SKU: 33812-1013

$7.95USD or lower Each

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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..

Color chart intervals: 10, 10.5, 11, 11.5, 12, 12.5, 13
  • Intervals of 0.5 pH unit but can resolve 0.25 with practice
  • Dip strip, shake off excess liquid, compare to color chart immediately
  • Minimum shelf life is 3 years if kept sealed but 5 years is typical
  • Store at room temperature away from sunlight.
  • The number of strips (50) per pack or vial is approximate.

Test Strip Documentation

Stability Statement Certificate of Analysis SDS
Indigo pH paper 10-13 base 0.5 pH intervals Stability Statement Indigo pH paper 10-13 base 0.5 pH intervals Certificate of Analysis Indigo pH paper 10-13 base 0.5 pH intervals SDS
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