| Cat. No. | Surface tension mN/m | PK | |
|---|---|---|---|
| 11926427 | 36 | 1 | |
| 11926437 | 38 | 1 | |
| 11926450 | 40 | 1 |
The pens use test ink with a defined surface tension, which is coloured blue. The surface tension of the material to be tested can be determined by simply brushing on the test inks.
They are available in a range from 28 to 72 mN/m surface tension (inquire if necessary). Alternatively also available in bottles.