Aluminum Frame & Ruler: The angle gauge frame is made of aluminum, compact and very practical. Portable size with ruler, easy to use for working. Hold Zero Function --- By using the HOLD function, the readings can be "frozen" on the screen and the ZERO function allows the zero to be adjusted in any position. Digital spirit levels can be used in a normal position or for inverted measurements. 4 units of measurement --- The electronic inclinometer also offers bevel and angle height measurements in inches/ feet, degrees, millimeters/meter, and percent grade. Plus, it's convenient to take on the go as it weighs little and its small size means it can fit in tight places. Audio Indicator: This digital angle gauge and level have a switchable acoustic signal function. Beep by beep when you reach 0 or 90. They are both dustproof and splashproof. Magnetic V-groove base: The bevel gauge with V-groove and 3 strong magnets built into the base, you can You can easily mount this tool to metal surfaces, such as pipe, conduit, metal fabrication and steel frame. Size: 4*90mm Color: Black Quantity: 1 piece