Extremely high protection: thanks to ULTRA-PROTECT, the electronic spirit level is well protected against dust and water according to IP 67. Even temporary cleaning under water is no problem Modern measurement: delay-free measurement value determination of inclinations and slopes. Thanks to CAL-FREE, recalibration is not necessary, even after drops or temperature fluctuations Optimal readable: 2 digital displays illuminated at the touch of a button. Acoustic target guidance with 2 beeps for quick alignment of components. Digital display rotates in envelope position Precise: At 0° and 90°, the accuracy of the electronic tilt measurement is ± 0.05°, from 1° to 89° at ± 0.1°. Display Modes: °, %, mm/m, in/ft. Operating time: approx. 400 hours. (without lighting) Practical: reference angle function for taking, storing and transferring an angle measurement to other components. Keyboard lock to protect against accidental input. Includes carry bag