Feature 1The measuring surface is magnetic, which is convenient to be attached to the object measuring workpiece. 2With conversion slope and slope percentage, there are absolute and relative measurement modes. 3Large clear LCD display, high accuracy resolution, measurement data can be held. 4Ultra small size, portable design with simple operation. With calibration button. 5Adopts high quality ABS+stainless steel material, light weight and durable.Item Type: ProtractorMaterial: ABS+Stainless SteelColor: As shown in the pictureProduct Size: Approx. 6x5.6x2.4cm / 2.4x2.2x0.9in Weight: Approx.72g/2.5ozBattery: 2 x AAA battery(Not included)Measuring Range: 490Resolution: 0.05Operating Temperature: 0~40Working Humidity: 40~80% humidityHow to Use:1. Absolute angle measurementPress ON/OFF, and the machine will directly enter the absolute angle measurement state (you need to load the battery directly when you turn it on). It will display the angle between the measured surface and the level. When the angle between the working surface of the unit and the horizontal plane changes, the angle value also changes. When the two indicator arrows on both sides of the LCDdisplay appear, the working surface of the display unit is not on a horizontal surface. For example, when the arrow "" on one side appears, it indicates that this side is below the horizontal line. It needs to be moved to this side of the unit to reach the level. The arrow "t" indicates that it is above the horizontal line. When the working surface of the machine is on a horizontal plane, the two indicator arrows will disappear,2. Relative angle measurementPlace the working surface of the machine on the surface that needs to be preset, press the CALICARBATE button to display "0.00". Then move the measuring unit to another surface to be measured, and the displayed value is the angle between the two surfaces. Press the CALICARBATE button for 3~5 seconds, it will switch to the absolute measurement state3. Upright displayThe displayed value will not be inverted, regardless of whether the unit is inverted or not. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Protractor(Battery Not Included)1 x Instruction ManualNote1. Do not clean with organic solvents, keep away from water and corrosive substances.2. Do not damage or abrade the working surface, use a soft cloth to remove dirt and maintain accuracy.3. If the instrument is not used for a long time, the battery should be removed for storage.4. When the power supply voltage is too low, the battery symbol flashes, please replace the battery as soon as possible.5. Because this product is only suitable for two‑axis measurement, when the third axis (front and back) and the horizontal angle are less than 45, the LCD displays the error message "error".