The Hultafors HVP30 Craftsman Magnetic Level 30cm.

The Hultafors HVP Craftsman Magnetic Level has a strong aluminium profile with magnets on the underside. Its crush-proof block vials are highly transparent and durable. Horizontal vial with a magnification lens and luminescent reflector.
The vial liquid has a low viscosity gives the bubble optimal freedom of movement. Highly resistant to ultraviolet light and temperature fluctuations. The bubble is not affected by static electricity as the fluid is anti-static.
The radius of the vial is 200mm, giving a sensitivity of 10 mm/m. Tolerance in normal position is ±0.5 mm/m, upside down ±0.75 mm/m.