Stabila 80A-2 100cm 3 vial spirit level.
This spirit level can be used to check the horizontality of overhead surfaces by turning it and its horizontal vial upside down. In this so-called "transfer" position, you can then measure precisely from underneath.
Light metal rectangular profile with milled measuring surface (up to 120cm), 2 vertical vials and 1 horizontal vial.
Measurement accuracy: in the normal position 0.029° = 0.5mm/m. For overhead measurements: 0.043° = 0.75mm/m.