Plastic pH Strips for quick accurate pH determination

These pH indicator strips contain special indicator dyes that are covalently bound to flexible plastic strips.  This special method of manufacture gives the pH indicator strips decisive advantages over indicator papers: since the indicator does not bleed, the strips can be left in place in the measurement medium for an indefinite time without contaminating the medium. Self life of 3-5 years. Each pack contains 100 strips.

Directions:
1) Remove the strip from the box.
2) Immerse the reaction zone of the strip into the solution for approximately 3-5 seconds or
until there is no further color change.**
3) Remove the strip from the solution, wiping the strip along the edge of the vessel to
remove excess liquid from the strip.
4) Compare the reaction zones to the color chart on the box holding the strip to the top of the
box with the reaction zones to the bottom of the box.
5) Record the results of the closest matching color to the strip.

** For weakly buffered solutions, an extended period of time may be necessary. In these cases, immerse strip until there is no further color change (1-10 minutes). Because the indicator is covalently bound to the strip, the test strip may be immersed in the solution for longer periods of time if necessary.