This digital level is a highly versatile leveling tool designed for fast, easy operation by carpenters, stonemasons, bricklayers, other building trades workers, surveyors, millwrights and other metalworker, and in some photographic or video work, particularly in civil engineering applications, such as building construction and steel structure erection, for on-site angle alignment and leveling . RELATIVE OR ABSOLUTE ANGLE MEASUREMENT - The regular absolute measurement mode can measure the angle against horizontal plane. This tool also features with relative measurement mode for quickly measuring angle between two measured surfaces. EASY READABLE VA DISPLAY SWITCHABLE UNITS Clear and bright VA display allows you to use this device in the dark without light. Display modes can be converted from degrees (') to percent (%), to (mm/m), to pitch (IN/FT). STRONG MAGNETIC V GROOVE BASE HOLD FUNCTION - The V Groove base with strong magnets enables strong attachment over a curve or cylindrical magnetic surfaces such as metal pipeline or shafts. Hold function helps save the current angle on the display. SMART AUDIBLE BUZZER - This inclinometer has beeper sounds feature at horizontal position (0) or vertical position (90) which makes you more convenient and easier when it is in use. You can also listen it where you are unable to see the display. WIDE APPLICATIONS Great tool for automotive, wood mechanical industries, machinery, medical fields and etc.