Mini Digital ProtractorLong press "ON/OFF" for 3 seconds to turn on the protractor. The "UNIT" key changes the degree or percentage. "CAL" switches absolute/relative mode, press "CAL" to enter relative mode, then press and hold "CAL" for 4 seconds to return to absolute mode. The bottom of "HOLD" can save the value, you won't miss any important reading anymore. It is more useful and easier for your work. Strong Magnetic Base and LCD DisplayThe base of the electronic level has three magnets, which can be easily attached to any steel object. The level angle meter has a large LCD display and the level can be read quickly. When the product is upside down, the number is automatically reversed. Zinc Alloy ShellDifferent from other plastic shells, our digital protractor adopts zinc alloy shell, which has good heat dissipation, waterproof, moisture-proof and beautiful appearance. Convenient to CarryThe magnetic protractor is a lightweight and portable measuring tool that can be taken with you. It is particularly useful for carrying out work on ladders, roofs or other unstable locations.