Precision Angle Degree Indicator, scope 25.4mm Bubble Level Spirit Tube Scope Ring） This precision-machined, aircraft-grade aluminum Angle Degree Indicator (ADI) takes the guesswork out of uphill and downhill shots. This ADI is calibrated in degrees give you an instant read out which can enter directly into ballistic software program on your pocket PC or use with a pre-printed angle drop chart to achieve high accurate shooting. The red needle moves with your and displays a number that indicates the percent your is off level. Multiply the indicated percent by the target distance to easily calculate the adjusted distance for gravity. CNC machined insert will also allow you to fit this indicator on both 1 Inch and 30MM scopes. The bubble level which can be flipped to the side also allows you to have an additional indicator to achieve much higher accuracy. Condition： 100% of New Full Metal Construction Ring Major Color: Matte enrolle