Buffer solution lets you calibrate any pH tester to ensure accuracy. Choose from pH 4, 7 or 10.
- Solution helps you achieve the accuracy that’s critical for measuring pH in wastewater, storm water and process liquids
- Makes calibration easy – just adjust your tester to the pH measurement of the solution in a clean container
- Choose from pH 4, 7 or 10 solution
- If unopened, shelf life is 2 years; once opened, use pH 4 and pH 7 within 90 days, pH 10 within 30 days
Buffer 10 Standard
pH calibration challenge
To calibrate pH measuring systems you must use a solution with a known pH value, also known as pH reference or buffer pH solution. The accuracy of your subsequent pH measurements is dependent on how accurately the pH measuring system is calibrated, so particular attention must be paid to this step. Because there are a great number of different buffer pH solutions available many people are uncertain about how many and what pH calibration solutions should be used.
What is a buffer pH solution and how many pH calibration points are reasonable?
A buffer pH solution is composed of either a weak acid and the conjugated base or a weak base and the conjugated acid. The main characteristic of a buffer pH calibration solution is that the pH value of the solution will not alter when a small amount of acid or a base is added. The components and their concentration can cause the pH value of the calibration solution to vary across a large range e.g. with HCl and sodium citrate (pH 1-5), citric acid and sodium citrate (2.5 – 5.6), acetic acid and sodium acetate (3.7-5.6), Na2HPO4 and NaH2HPO4 (6-9) or borax sodium hydroxide (9.2-11).