The ready- to- use buffer solutions from ROTH were manufactured with extreme care from exceptionally pure buffer substances. This dispensed with the time- consuming processes of drying and weighing the reagents. By comparing the results to standard buffer solutions acc. to DIN 19266 the ready- to- use buffer solutions are adjusted to their respective pH values. These standard buffer solutions can be traced back to primary PTB and/or NIST reference materials. Precise compliance with the pH value enables the measuring equipment to be calibrated precisely and rapidly. These buffer solutions are stabilized against algae and bacterial action.