The digital spirit level is a highly versatile spirit level tool designed to quickly and accurately measure angles on surfaces. 4 tilt angles Units: Angle is measured in (degrees), % (percentages), mm/m and IN/FT. Anti-pinch LED displays readings. V-shaped slots and built-in magnets on the base: The V-shaped slots on the measuring base can be easily attached to round tubes for precise measurements. And powerful magnets to attach iron or metal surfaces. Grooves on both sides of the housing: easy marking work. Auto power off and low battery indicator: The device will automatically turn off after approximately 3 minutes of inactivity. Powered by 2 x 1.5V AAA batteries with low battery indicator. Data Hold: Hold function to freeze measurements so you can move the device to read the display.