High precision measurements: Made of aluminum alloy and ABS, digital angle gauge with four units of measurement: , %, mm/m, and in/ft. Wide measurement range: 4 x 90, with 0 and 90 adjustable calibration, provides precise measurements with an accuracy of 0.2 degrees. Easy to read: This digital angle gauge features a large digital LCD display for quick and easy viewing. The green backlight allows you to read the measurement in dim light, making it convenient to use at night. Auto shutdown: Backlight automatically turns off after 30 seconds without movement. The unit automatically powers down after 3 minutes of inactivity, or can be manually turned off by pressing and holding the OFF button for 4 seconds. Freeze function: Press the HOLD button to save angle measurements, allowing you to easily store and review measured data. Magnetic base and battery powered: This digital inclinometer has a built-in magnetic base for secure attachment to any iron surface. Powered by 2 AAA batteries (not included, for transport safety reasons; must be purchased locally). Includes a low battery indicator.