Round horizontal vial with a magnifying effect, provides unsurpassed readability, also for inverted measurement. Strong walls for longer service life and shock-absorbing rubber caps. Highest accuracy (0.5 mm / m) due to ultrasonically-welded vials. Inverted measurement (0.75 mm / m).
Our Spirit Level glossary (PDF)
provides a good comparison of the selected BMI Levels: The 690, 691, 692, 695, 698 and 699 and the 660, 661 and 665 models are listed here.
Spirit Level glossary (PDF)
| Design | 20cm | 30cm | 40cm | 50cm | 60cm | 80cm | 90cm | 100cm | 120cm | 150cm | 180cm | 200cm |
| Alustar 691 | x | x | x | x | x | x | x | x | x | x | x | x |
| Alustar 691 M | x | x | x | x | x | x | x | x | x | |||
| Alustar 691 S | x | x | x | x | x | x | x | x | x | x | ||
| Alustar W | x | x | x | x | ||||||||
| Alustar WM | x | x | x | x |
