Pipette, Glass, Graduated, Class B one-mark (bulb) pipettes are manufactured in soda-lime glass to ISO648 and DIN12690 standards and calibrated for delivery, with amber stain graduations and inscriptions. The 1 and 2ml sizes are straight pattern without bulb and the 15ml size is supplementary to the ISO and DIN ranges.
Tolerances and colour code:
| Capacity, ml | Code | Class B |
| ±ml | ||
| 1 | Blue | 0.015 |
| 2 | Orange | 0.020 |
| 5 | White | 0.030 |
| 10 | Red | 0.040 |
| 15 | Green | 0.050 |
| 20 | Yellow | 0.060 |
| 25 | Blue | 0.060 |
| 50 | Red | 0.100 |
| 100 | Yellow | 0.150 |
