With A V-GrooveThe digital inclinometer has a magnetic base with a V-groove, so you can quickly and easily attach saw tables, band saws, metal bars and even round pipes .Unit of measurement ( degrees / % / mm / m / IN / FT) LCD display The digital inclinometer makes it easier and clearer to read the values even at night because the improved LCD display works with new black and white characters. In addition, the digital inclinometer with low battery indicates. Auto ReversingHigh precision level bubble vial on top, for leveling work without battery. The display has been automatically inverted when the head is down. Zero and Hold Functions allow precise measurement of absolute AND relative angles, bevels and slopes on all imaginable surfaces. With 2 AAA BatteriesThe Digital inclinometer works with 2 AAA batteries (included in delivery) and switches off automatically after 5 minutes without operation.