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Here are some of the great features of Thomas Yellow Monobasic Potassium Phosphate and Sodium Hydroxide Buffer Solution, pH 7, 1 gallon Plastic Bottle

Thomas Yellow Monobasic, Traceable to NIST standards and available in a variety of packaging selections. Provides a tolerance of ±0.01 pH at 25 degree C and the bottle label provides temperature correction data from 0 - 50 degree C. All Thomas buffers offer improved record keeping and documentation with two-year shelf life (unopened), manufacturing lot codes, expiration out-dates and fill-in-the-blank sections for date received and date opened. The pint and quart buffer bottles come with an inner cone cap to prevent leaking. 19 liter sizes are supplied in a cube shaped, cardboard encased polyethylene container with a spout. A minute amount of colorant in these solutions provides immediate visual identification: yellow for pH 7. 0.01 pH unit tolerance at 25 degree C. Color-coding reduces probability of error in pH meter calibration checks, preventing gross errors in measurement.