Frame brass.
Tubular bubble vial glass.

Nickel-plated and high-gloss polished. Style B: black anodized.

Bubble levels are used as a type of zero indicator instrument for checking horizontal inclination in e.g. spirit levels, inclinometers, metrology instruments and machine constructions.
The tubular levels can be fastened using the two holes.
- style A: one sight window
- style B: three sight windows
- Sensitivity in angular minutes for 2 mm bubble travel
- Green filling

-35 °C up to +55 °C.