Tri-Angle Bubbles The FSL400AL spirit level has three bubble angles: horizontal, 90 and 45, and each bubble is protected by a plastic ring. The horizontal bubble has three viewing angles for reading, and 90 and 45 have two viewing angles for reading. m (German standard), with 40 scale for measurement marks, which is not easy to wear and durable. Strong MagnetThe bottom of this magnetic spirit level has a non-slip indentation of wave and two strong magnets to facilitate the use of marks on the surface of metal objects. Small and portable Both ends of this mini spirit level are wrapped with hard plastic, which prevents slipping of hands , is convenient for one-handed measurement and marking, and is compact and portable. One Year WarrantyOur spirit level promises one year warranty. If you have any questions, please contact our after-sales service.