The Hultafors D Spirit Level made with a digital unit mounted in a robust aluminum box profile. Fitted with shock absorbing end protectors, also having an anti-slip function. The display shows tenths of degrees, percentages, mm/m or inch/feet. Measurement area is 360°, split into four 90° zones. Its vials are highly resistant to ultraviolet light and temperature fluctuations. The vials have a +30% magnification lens and the horizontal vial has a luminescent reflector. Automatic shut-off after 5 minutes helps to prolong battery life and its easy to change them when required. Tolerance of vials in normal/ upside down position is ±0.5 mm/m. Electronic unit tolerance in horizontal (0°) and vertical (90°) position is ±0.05°, for other angles ±0.1°.