Product 1: simultaneous horizonal and vertical level: parallel alignment on floors, ceilings and walls with a horizontal and two vertical lines. Accuracy of ± 0.2 mm/m*/**. Product 1: CAL GUARD MONITOR: The red LED light warns users of possible calibration errors that can be displayed in detail in the app. Product 1: Simply connected: with the levelling app on your smartphone simply set the device and operate it via Bluetooth. Product 1: Dual Power Source: For more flexibility, the device can be used with a 12 volt lithium-ion battery or via the battery adapter with AA batteries. Product 2: For all measurements of floor heights. Product 2: Robust, high-quality aluminium profile. Product 2: Extends up to 2.4m. Product 2: For use in extreme conditions.