Standardized and certified traceable to NIST Standard
- Color-coded for quick reference
- Accuracy ±0.01 pH at 25°C
- pH temperature chart, lot numbers and expiration dates on each label
pH 4.0 buffer is colored red, 7.0 buffer is yellow or green and 10.0 buffer is blue.
Thomas numbers 4120R54, R60 and R66 are single-use pouches.
Tested in an ISO 17025 Accredited Laboratory.